因此，如果有人想退出发布商情，他必须确保它到达之前或同时验收发布的受体。

So, if anyone wishes to withdraw an offer by post he must make sure that it reaches the acceptor before or at the same time as the acceptance is posted.

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罗西需要雇佣更多的工匠，这样他们可以确保订单按时完成。然后，他还必须建立两个新的仓库，使配送更快。

Rossi needed to take on more craftsmen so they could make sure the orders were ready on time, and then, he also had to set up two new warehouses to make distribution quicker.

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在很多学校，如果学生需要带手机来学校，他或她的父母必须写一份声明，确保手机在课堂上是关闭的。

In lots of schools, if a student needs to bring a phone to school, his or her parents will have to write a statement and make sure that the phone is turned off during class.

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