Pull the string, and it will follow wherever you wish. Push it, and it will go nowhere at all.

Pull the string, and it will follow wherever you wish. Push it, and it will go nowhere at all.

拉一拉绳子，它就会跟着你。推动它，它将不会去任何地方。

-- Dwight D. Eisenhower 德怀特·艾森豪威尔