【英语时差8,16】手为什么会发抖-下

By exchanging signals, the cortex on the basal ganglia allow your hand muscles to hold their position. This cycle of signals repeats continuously entire time your hand is extended, but by most mysteries of brain, this one involving motor control is not fully¹ understood by scientists. However, scientists believe that the mental effort required to hold your hand still causes the muscles in your hand to contract a bit at a regular a* and therefore, experiences a tremor², even under normal circumstances. When you are nervous, the part of your brain that regulates anxiety interferes³ with response cycle between the cortex and basal ganglia, increasing the severity of these muscle contractions⁴ and then altering your ability to actually control the position of your hand. Though your hand will shake a little bit under normal conditions, it will shake a lot more when these nervous feelings influence your hand control.

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1 fully   

adv.完全地，全部地，彻底地；充分地

参考例句：

• The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。
• They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。

2 tremor   

n.震动，颤动，战栗，兴奋，地震

参考例句：

• There was a slight tremor in his voice.他的声音有点颤抖。
• A slight earth tremor was felt in California.加利福尼亚发生了轻微的地震。

3 interferes   

vi. 妨碍，冲突，干涉

参考例句：

• The noise interferes with my work. 这噪音妨碍我的工作。
• That interferes with my plan. 那干扰了我的计划。

4 contractions   

n.收缩( contraction的名词复数 )；缩减；缩略词；（分娩时）子宫收缩

参考例句：

• Contractions are much more common in speech than in writing. 缩略词在口语里比在书写中常见得多。 来自《简明英汉词典》
• Muscle contractions are powered by the chemical adenosine triphosphate(ATP ). 肌肉收缩是由化学物质三磷酸腺苷(ATP)提供动力的。 来自辞典例句