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

其他水生昆虫，如水蟑螂，就像图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：了马卡多， 踩踏者默不作声地一致行动，他在计时。