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PBS趣味科普

Other aquatic insects like water treaders exploit surface tension, just like thumbtacks and paper clips.

其他生昆虫,如,就像图钉和回形针一样利用表面张

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透视百科美食类

The treaders move in unison and in silence, except for the marcador, who marks the time.

克劳迪娅:除了马卡者默不作声地一致行动,他在计时。

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