【英语时差8,16】走路为什么摆臂？-上

Have you ever wondered why we swing our arms while walking? It’s a curious phenomenon, since arms don’t play an obvious role in locomotion¹. You can still walk normally when your arms are full of groceries or with your hands in your pockets, so why do we do it? Isn’t it a waste of energy? Two independent studies, both published in 2009, may provide some answers to this mystery.Using a combination of mechanical models, computer simulations and tests with human walkers and runners, the studies concluded that arm swinging just sort of…happens. In other words, you don’t need muscles for your arms to start swinging, although you can use muscles to swing your arms higher or more forcefully. If you’re walking and your arms are hanging relaxed by your sides, they will normally swing in sync with the opposite leg. That is, your right arm swings forward when your left leg steps forward and vice² versa.

1 locomotion   

n.运动，移动

参考例句：

• By land,air or sea,birds are masters of locomotion.无论是通过陆地，飞越空中还是穿过海洋，鸟应算是运动能手了。
• Food sources also elicit oriented locomotion and recognition behavior patterns in most insects.食物源也引诱大多数昆虫定向迁移和识别行为。

2 vice   

n.坏事；恶习；[pl.]台钳，老虎钳；adj.副的

参考例句：

• He guarded himself against vice.他避免染上坏习惯。
• They are sunk in the depth of vice.他们堕入了罪恶的深渊。