to discover the main cause of a problem
发现问题的根本原因 (fāxiàn wèntí de gēnběn yuányīn)
"We need to get to the root of the problem before we can fix it."
"我们需要在解决问题之前找到问题的根本原因。" (Wǒmen xūyào zài jiějué wèntí zhīqián **zhǎodào wèntí de gēnběn yuányīn**.)
to return to an earlier time; to undo progress or change
to be uncertain or have both positive and negative emotions
The older you get, the wiser you become, due to experience.
a course of action that seems to lead to undesirable or dang...
to use one’s power or influence aggressively
something that gives a sense of safety or comfort
