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重点讲解：
1. refer to 指的是；
例句：In some contexts it can be used to refer to any sort of occlusive vascular disease anywhere in the body, except the heart.
在某些语境中它也指代除心脏外全身任何地方的各种闭塞性血管疾病。
2. be made up of 组成；构成；
例句：Life is made up of little things.
[谚]人生是由琐碎的事物构成的。
3. or so …左右；…上下；
例句：Though rates are heading down, they still offer real returns of 8% or so.
尽管利率在下降，它们仍然能提供 8%左右的实际收益率。
4. each other 彼此；互相；
例句：We looked at each other in silence.
我们相顾无言。
n. 标题，题目，航向
动词head的现在分词
