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1.look around 游览，到处察看
例句：Look around if you like.
你可以四处看看。
2.point out 指出，指明
例句：But, we just need to point out the risk to them that they may well lose their lives.
但是，我们恰巧需要指出，他们面临的风险很可能是失去他们的生命。
3.act as 担当，担任
例句：
The freedom of buoyancy allows us to act as we truly are.
由于处处存在的浮力，我们的行动也更加随心所欲。
4.let alone 更别提，更不用说
例句：Clinically depressed people often can't get out of bed, let alone command an army.
临床的消沉症患者经常不能离开床，更不能指挥一支军队。
