せいこうのかぎ· also せいこうのカギ
key success factor; key to success; KSF
Also written 成功のカギ
Expression, Noun
たゆまぬ努力どりょくが成功せいこうの鍵かぎであることは言いうまでもない。
It goes without saying that diligence is the key to success.