Hearing that one neighbor had just welcomed a new litter, Allen, a9- year- old boy, rushed to see the newborn cats. However, during his visit, Allen noticed one of the cats wasn't moving due to disability on its hind（后面的）legs. So while the other little cats were exploring their surroundings, this one stayed behind.
Allen was significantly affected by the scene of this lonesome cat. He returned home and started to wonder whether he could do anything to help. When the boy told his mother about that, the mother recalled a video about pet wheelchairs.
They finally found the video on YouTube, in which an animal lover, Addy, shared a heartwarming and innovative project: building a wheelchair for a pet cat with mobility issues due to a hind- leg injury. As a caring pet owner, Addy took viewers through the DIY process of making a custom wheelchair to aid her cat's movement and improve its quality of life. She began by measuring the cat and based on the measurements, cut the plastic pipes to make a frame（支架）. Then she connected the pipes and attached the wheels to the back end of the frame. Finally, she added a harness（保护带）to ensure it was fit and comfortable for the cat.
Seeing the cat in the wheelchair moving around happily with the support, Allen thought that would be the best option for the little cat.
But the wheelchair in the video seemed too big and too heavy for a newborn cat. Where could he find the suitable materials?
His mother unearthed an old bag from the cupboard, whose belt was just fine for the the harness. As for the frame, they searched the storage room in their house and found an old umbrella, whose frame provided enough thin iron bars that were durable and light. But they were difficult for him to cut off. Allen thought his father could help. However, where could they find the small wheels?【答案】
（320 words）
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Allen suddenly spotted a familiar item in the corner of the storage room.
Together, they built a tiny wheelchair for the little cat.
