1、leave to 留给；交托
例句：
And that means all of us: no disrespect, but it's far too important to leave to our friends in the IT department alone.
这个是指我们所有人:没有任何不敬，只是这个太重要了以至于不能把它们仅仅留给我们IT部门的兄弟们。
2、a good command of 精通
例句：
No one can grasp clauses well without a good command of the seven sentence structures.
如果基本句型没有掌握，是很难写出长句的。
3、talk big 吹牛
例句：
Some Australians talk big but actually think small, and politicians may be the worst offenders.
许多人夸夸其谈却并未做过多思考，首当其冲的就是政治家们。
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