不到火候

不到火候:

Literally means:

the fire is too weak; the time is too short when heating up something with fire

Actually means:

The fire is too weak or the time is too short when heating up something with fire.

This phrase means that someone's abilities do not meet the demands of certain criteria. It also means that someone is not experienced enough. Slightly derogatory.

用火加热时火力太小或者时间太短。

这里指功力还没有达到应有的程度，或者指修养的程度 太浅。略含贬义。