One swallow doesn't make a summer.
	一燕不成夏 解析：意指凡事不可以偏概全。亦可指一件好事發生並不代表接下來一切順利。 E.g. Okay, they won the last game, but one swallow doesn't make a summer. They're still bottom of the league. 好吧，他們贏了上一場比賽，但是一燕不成夏，他們在聯隊中仍然殿後。