1.close up 关闭；愈合；靠近

Do not close up your heart.
不要把你的心关起。

Or will you close up like a shell and torture your partner with inconsolable silence?
或者你会像个贝壳那样关闭自己用极度沮丧的沉默折磨你的情人？

2.wrap up 包裹；圆满完成

Use a cloth to wrap up the wound.
用布把伤口包起来。

You should wrap up your neck in this cold weather.
在这样的冷天里，你应把脖子围起来。
3.pack into 挤进…里；塞进

According to the conventional view, liquid water has a similar, albeitless rigid, structure, in which extra molecules can pack into some ofthe open gaps in the tetrahedral arrangement.
根据传统观点，液态的水分子也是类似排列，尽管不那么严格，额外的分子会被包进四面体孔隙里。

PolyPlus's battery may be just that: Dip the encapsulated lithium pack into a glass of ordinary water and it produces current that lights up an LED display at the company's conference showcase booth.
而 PolyPlus 电池也许就是这样一种新技术：把密封包装好的锂浸入一罐普通的水中就能产生电流，可将公司展会展位上的LED灯点亮。

4.immune system 免疫系统

The immune system then kicks in, and the body and the virus wage all-out war.
此后，免疫系统开始发挥作用，身体与病毒之间的战争由此全面爆发。

Aids, he said, was brought about by the collapse of the immune system-but not because of a virus.
他说，艾滋病是免疫系统的崩溃所带来的，而不是一位某种病毒带来的。