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本集核心英语单词及例句：
1.collar (n.)衣领；颈圈
The girl's shirt collar is laced.
女孩的衬衣衣领有花边。
2.hierarchy (n.)层级；等级制度
There is a hierarchy in all living creatures.
一切生物均可按等级分类。
3.underling (n.)下属，部下
You are no longer dealing with some underling.
你不再和一些部下打交道了。
4.executive (n.)总经理；执行委员会
Some of the executive staff were eased out to cut down expenses.
为了削减开支，有些行政管理人员被辞退了。
5.upper level 高层；高等级
I would like a room on the upper level.
我想要一间高档的房间。
6.defined (adj.)有定义的，明确的;，清晰的
These categories are not well defined.
这些类别划分得不太明确。
