the shot in the arm
鼓舞
A:Good news!
A:好消息!
B:What is it?
B:什么消息?
A:The state of economy is starting to go up in our country.
A:我們國家的經濟狀況開始好轉。
B:That's just the shot in the arm we need.
B:那正是我們所需要的鼓舞人心的消息。