at a time和at all times的区别

at a time的意思是: 每次;一次;一度。例句如下:

You will have more of them if you do one thing at a time.

如果你一次专注于一件事情,你就会有更多这样的体验。

at all times的意思是: 经常;在任何时候。例句如下:

If you want to be safe, you need to safeguard your reputation at all times.

如果你想要安全,你需要随时维护你的声誉。

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