【英语时差8,16】手为什么会发抖-上

Hold your hand out and try to keep it perfectly¹ still. After a moment, it will probably begin to shake. Hold that same hand out just before you give a major presentation to your new boss, and you’ll notice that those normal small tremors² increase substantially. Why? The answer has to do with how nervous feelings influence a response cycle between two parts of your brain. These parts are called the basal ganglia and the cortex. In order for your brain to control the steadiness of your hand, the cortex and the basal ganglia exchange signals with each other. First, the cortex sends a signal to the basal ganglia; the basal ganglia, in turn, responds returning a signal to the cortex. These signals are the basis of motor control.

1 perfectly   

adv.完美地，无可非议地，彻底地

参考例句：

• The witnesses were each perfectly certain of what they said.证人们个个对自己所说的话十分肯定。
• Everything that we're doing is all perfectly above board.我们做的每件事情都是光明正大的。

2 tremors   

震颤( tremor的名词复数 )； 战栗； 震颤声； 大地的轻微震动

参考例句：

• The story was so terrible that It'sent tremors down my spine. 这故事太可怕，它使我不寒而栗。
• The story was so terrible that it sent tremors down my spine. 这故事太可怕，它使我不寒而栗。