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1·An offeror may withdraw an offer at any time before it has been accepted.

在要约被受要约人接受以前，要约人可以随时撤回要约。

2·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.

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。

3·An offeror may withdraw his offer at any time before the offeree has accepted it.

一个要约人可以在受要约人承诺以前的任何时候，撤销他的要约。