If you do not use your arms or legs for some time, they will become weak. When you start (use) them again, they slowly become strong again. Everybody knows that！Yet many people do not seem to know that memory works the same way.
When someone says that he has good memory, he really means that he keeps his memory in practice by using it. When someone else says that his memory is poor, he really means that he does not give it enough chance (become) strong. If a friend says that his (arm) and legs are weak, we know that it is his own fault(错误). But if he tells us that he has a poor memory, many of (we) think that his parents may be to blame(应负责) and few of us know that it is just his own fault. There's a study showing some people can't read or write but usually they have (good) memories. This is because they (can) write something down in a small notebook, they have to remember all the things, so the memory is the whole time being exercised.
So if you want to have a good memory, learn from the people: practice remembering the things in the same way other people do.
