Grownups are often surprised by how well they remember something they learned as children but have never practiced ever since.A man who has not had a chance to go swimming for years can still swim as well as even when he gets back in the water.He can get on a bicycle after many years and still ride away.He can play catch and hit a ball as well as his son.A mother who has not thought about the words for years can teach her daughter the poem that begins “Twinkle，twinkle，little star” or remember the story of Cinderella or Goldilocks and the Three Bears.
One explanation is the law of overlearning，which can be stated as follows: Once we have learned something，additional learning trials(尝试) increase the length of time we will remember it.
In childhood we usually continue to practice such skills as swimming，bicycle riding，and playing baseball long after we have learned them.We continue to listen to and remind ourselves of words such as “Twinkle，twinkle，little star” and childhood tales such as Cinderella and Goldilocks.We not only learn but overlearn.
The multiplication tables(乘法口诀表) are an exception(例外) to the general rule that we forget rather quickly the things that we learn in school，because they are another of the things we overlearn in childhood.
The law of overlearning explains why cramming(突击学习)for an examination，though it may result in a passing grade，is not a satisfactory way to learn a college course.By cramming，a student may learn the subject well enough to get by on the examination，but he is likely soon to forget almost everything he learned.A little overlearning，on the other hand，is really necessary for one's future development.
HowtoMakeSureYouEnjoyYourTrip
A trip is a planned destination where one arranges in advance in which the main purpose is to search for adventure and to create a memorable moment.Here are the steps on how to make sure your trip is enjoyable.
●Plan it well.Trips are ideally planned for it to go well. A check list is helpful,making sure you've got all your needs.
●Pack necessities.Bring what you need.Trips are short journeys and belong to the sub-level of travelling.Pack only the things you need.
●Be safe.To be cautious is smart.No matter what you are up to,surfing,cliff diving,snowboarding,scuba diving...,it is always recommended to be safe. Don't be stubborn and put yourself in harm when there are precautions.
● You may see delays,a different culture,lifestyle,food,and even a shortage of cash sometimes—this is all what travel is about—experiencing things with a new perspective.Once you expect to experience new things,you'll be a happy traveler and free from stress.
●Save the memory. This is not one of those regular days so you ought to save the moment.It will make your trip more enjoyable after all that craziness;you get something to review the good times.
A.Travel with an open mind.
B.Get prepared for everything new.
C.This is all we expect from a trip.
D.Seize the moment by taking pictures.
E.It is important to wear protective equipment when advisable.
F.It is easy to get tired if you have too many things in your package.
G.Take your time,a day or a week ahead to make a plan for your trip.
Most people all over the world travel by the road. In a city in Italy, however, waterways make up the primary commuting routes. The city of Venice is best known for its canals. Unfortunately, this beautiful city of flat－bottomed boats (Gondolas), and churches is sinking and sinking fast.
Known as the “Queen of the Adriatic”， Venice is situated on 120 islands formed by canals between the mouths of the Po and the Piave Rivers. And even the bits of firm ground have rather boggy (泥泞的) foundations and all this is slowly getting eroded (腐蚀)．
The existing ground water table and the global climate changes that have raised sea levels by several inches, are proving its disaster for the city. As sea－ice melts and water levels rise, floods in Venice are getting from bad to worse. And buildings are already feeling the impact of this phenomenon, with their foundations literally being shaken. Take one of the most famous landmarks of Venice for example, the 900－year－old St. Mark's Basilica, now leans slightly to the left.
Experts warn that the city may sink an additional eight inches in the next 50 years. Many scared residents have already started to move to drier regions in Italy's mainland. To deal with the flood threat, a group of Venetians, called the New Venice Consortium, has come up with “Project Moses”—a dam project named after the biblical figure, Moses. The idea is to place underwater gates at different points where the Adriatic Sea water enters the lagoon (环礁湖). When the water is low, the gates will remain open and as the water rises, the gates will close, preventing the seawater from flooding Venice. However, some people disagree with this idea. Environmentalists point out that the gates would have to remain closed most of the time and seawater will not be able to move in and out of Venice. As a result, the lagoon water will become stagnant (停滞的), harming the fish and plants that live there. Until a viable solution is found out, Venice, it seems, would continue to be threatened by floods. Truly, a case of being caught between the devil and the deep sea!
