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1.nervous system 神经系统
例句：They recorded the action of the drug on the nervous system.
他们记录了药物对神经系统的作用。
2.spinal cord 脊髓
例句：That's the three layers of tissue that surround the brain and spinal cord.
我是指包围着大脑和脊髓的三层组织。
3.define as 定义为
例句：All of these we may define as our needs.
所有这一切，我们都可将其确定为必需品。
4.build up 加强，建立
例句：During the summer holidays,traffic builds up along the roads to the coast.
每到暑假，在去海滨的路上车辆就拥挤起来。
