to be so worried or upset that you don't know what to do
担心或烦恼到不知道该怎么办
"I'm at my wits' end trying to calm the kids down."
"我在尽力平静孩子们时已经精疲力尽。"
to do something innovative or pioneering
a crucial test that proves the value or success of something
something sounds familiar
to swear that something is true, often said with sincerity
Something intended to secretly undermine or bring harm from...
to campaign for a political position
