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。
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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