Knock first, then wait to be invited in.
应该先敲门，然后等待进入的邀请。
我一般会先敲下门。
Let's knock down the machine first. It'll save shipping costs.
我们先把机器拆开，这样可以节省运输费用。
I promise you they'll knock people dead the first time they see them.
我向你保证，人们一看广告就会喜爱得要命。
I promise you they'll knock people dead the first time they see them.
我向你保证，人们一看广告就会喜爱得要命。
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