Although these matching functions are very powerful, they are not complete.

尽管这些匹配函数功能非常强大，但它们还不完善。

youdao

Although the functions that accept callback functions are powerful, there isn't a good way to do a one-off callback function without some very inelegant work.

虽然接受回调函数的函数功能十分强大，但是没有一种好方法可以执行一次性回调函数，而无需执行一些非常笨拙的工作。

youdao