日本語 Japanese Ask Questions Thread 3

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Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

What's the best way to say "a well-known fact" in Japanese?

1.よく知っている事実
2.一般的な事実
3.周知の事実
4.ほかの方法

And at the same time, what's a good estimation of the phrase "what goes up, must come down"? My guess is something like:

「上がるものは下がるものになるはずだ」と言うのは周知の事実だ。
"It's a well known fact that what goes up must come down"

手伝ってくれてありがとうな