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Member for
3 years 10 monthsAge: 10
Level: 4
Language: Chinese
(zh)
ID: 587148
13/12/2020
Country code: MY
Country: Malaysia
Main content: 齿轮 (1228704)
From worksheet author:
齿轮是一种简单机械，由边缘有齿状的轮所组成
Other contents:
齿轮的用途与操作
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