a shot in the arm

"A Shot in the Arm"is a 1999 single by the American band Wilco from their album Summerteeth. The phrase "a shot in the arm"means "a stimulus"; originally this meant a stimulus from the injection of narcotic or medicinal drugs (a "shot"is US slang for an injection).

1. The new project was a real shot in the arm for the team.
   新项目真的是对整个团队的巨大鼓舞。
2. After a long week, the holiday came as a shot in the arm.
   经过漫长的一周，这个假期就像是一剂强心针。
3. His positive feedback was just the shot in the arm I needed.
   他的积极反馈正是我所需的鼓舞。