【英语时差8,16】虫子，涟漪与水上行走-下

How Do Water Bugs² Move? The answer lies in the little dimples that a water bug¹’s feet make in the otherwise flat surface. If the water’s surface really stayed as flat as ice, the bug wouldn’t be able to move. Those dimples give it some grip. Here’s how it works: The back side of each dimple provides an angle for the bug’s leg to push against. Even though the bug’s push makes the dimple move slightly backwards³ in the water, there’s still enough purchase for the bug to push itself forward. It’s like jogging through soft, dry sand. Our feet push the sand backward, which makes running a lot harder, but we can still move forward.

1 bug   

n.虫子；故障；窃听器；vt.纠缠；装窃听器

参考例句：

• There is a bug in the system.系统出了故障。
• The bird caught a bug on the fly.那鸟在飞行中捉住了一只昆虫。

2 bugs   

adj.疯狂的，发疯的n.窃听器( bug的名词复数 )；病菌；虫子；[计算机]（制作软件程序所产生的意料不到的）错误

参考例句：

• All programs have bugs and need endless refinement. 所有的程序都有漏洞，都需要不断改进。 来自《简明英汉词典》
• The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》

3 backwards   

adv.往回地，向原处，倒，相反，前后倒置地

参考例句：

• He turned on the light and began to pace backwards and forwards.他打开电灯并开始走来走去。
• All the girls fell over backwards to get the party ready.姑娘们迫不及待地为聚会做准备。