同意4，5，6，7。 1，2，3看不懂。

1，2，3基本是废话。因为真的没人知道什么是底。94不出手的人也不知道。但想在里面玩的人，总得有进场的时候。It's like a music chair, you just never know when the music stops. But as long as you would like to play the game, you just have to get ready to move around the chair, unless you quit the game. So I really don't bother to think whether it is the real bottom. Actually average cost could be applied to the bottom too. Just chip in some whenever there's a new bottom. Of course, the stock you pick has to be one which can survive the earthquake.