take someone by surprise 使感到意外，给某人一个措手不及

　　What you said really took me by surprise.

　　你说的话真的让我措手不及。

　　Let's keep this plan secret , so we can take them by surprise.

　　让我们先将这个计划保密，这样才能给大家惊喜。

　　疯狂练习吧！