穿针引线 [- - yǐn xiàn](比喻从中联系) get the thread through the eye of the needle — act as a go-between [middleman]; act as a matchmaker; act as liaison; pass the thread through the eye of a needle; thread a needle; try to make a match:
•¶ 科学技术协会发挥了穿针引线的作用。 The Science and Technology Association served the function of a go-between.