be off guard

If you should be off guard, you would double the loss.

如果你粗心大意，你一定会加倍损失。

When she stepped off the elevator into the cool, marbled lobby, it was empty; the security guard just happened to be on a break.

她步出电梯，进入到那铺着大理石的大厅。大厅很凉爽，空荡荡的没有一个人，值班的警卫正好去休息一会儿。

You'll be able to point people to the documentation so that they can see exactly what your design means to them, and you'll never be caught off guard when someone challenges your design decisions.

您能够指示人们参考该文档，以便他们可以确切看到您的设计对他们意味着什么，并且您决不会在某人挑战您的设计决策时失去警惕。