Some people tend¹ to have their finger in every pie.

有些人事事都爱插一手。

They try to do too many things at a time,

他们想一次同时做很多事。

and they end up achieving nothing.

结果一件事也没做成。

If you're smart, you should do one thing at a time.

你如果聪明的话，就应一次做一件事。

That way, the chances of success are much greater.

那样的话，成功的几率就大多了。

As the saying puts it, "If you run after two hares², you will catch neither. "

有道是：“同时追两兔，两头都落空。”