to relax and enjoy yourself freely
放松并自由地享受
"At the party, everyone let their hair down."
"在派对上，每个人放松自己并尽情享受。"
to attack someone's most vulnerable point
to be extremely happy and excited
to make noticeable progress
to start thinking seriously about solving a problem
to reach the desired standard or level
to make a bad situation seem better by dealing with it calml...
