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Sunshine
@yuqiyong
Live in China and tell coastal stories. Welcome to China for investment and tourism.
Joined June 2017
1.3K Following    4.8K Followers
Sunshine@yuqiyong
2026.05.20 08:20
齿轮能咬合就行？为什么工程师要造这种“人字形”齿轮？ #涨知识#
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