挠头 | náo tóu | tricky / problematic / difficult / to scratch one's head (in puzzlement) | |
成问题 | chéng wèn tí | to be a problem / problematic / questionable | |
先天不足,后天失调 | xiān tiān bù zú , hòu tiān shī tiáo | to be born with a weak constitution and suffer from ill health during one's life / (fig.) to be problematic from the start, and get even worse over time |