Do Striders at least twice a week.
每周至少进行两次大步跑。
Unit 38 Why Can Water Striders Walk Smoothly on Water?
水黾为何能在水面上行走如飞?。
Perhaps it's because Striders typically travel alone or in pairs.
也许是他们总是独行或是二人结伴而行的缘故。
Striders form many friendships, but fortunate is the friend who meets the Strider more than twice.
漫游者结交了很多朋友，但是幸运的是那些能再次遇到漫游者的朋友。
Some, like long-legged water striders, maintain a small measure of distance from the water with a cushion of air that lets them skate on the surface.
一些昆虫，比如长腿水黾与水面保持一定距离，利用空气垫在水面滑行。
"Our research group studies a lot of biologically inspired fluid mechanics problems, such as how snails use slime for locomotion, or how water striders walk on water, " Nasto says.
我们小组从生物界获取灵感，研究了大量相关流体力学问题，比如蜗牛如何运用黏液进行移动、水黾如何在水上行走。
"Our research group studies a lot of biologically inspired fluid mechanics problems, such as how snails use slime for locomotion, or how water striders walk on water, " Nasto says.
我们小组从生物界获取灵感，研究了大量相关流体力学问题，比如蜗牛如何运用黏液进行移动、水黾如何在水上行走。
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