重点讲解：
1. consist of
由…组成；由…构成；
eg. A week consist of seven days.
一星期由七天组成。
eg. Each group shall consist of not less than ten.
每个小组至少由十人组成。
eg. Their lives consist of the humdrum activities of everyday existence.
他们的生活由日常生存的平凡活动所构成。
2. close-knit
紧密相连的；密切合作的；志同道合的；
eg. Their class was a close-knit one.
他们的班集体非常团结友爱。
eg. We're a very close-knit family.
我们家非常团结。
eg. Events over the last year have created a close-knit community.
去年发生的一些事让整个社会紧密团结在一起。