从多年尝试瀑布模型的经验中我们得出，我们很少能够事先预知所有的事，试图在一开始就做对是不完美的。
As we know from attempting to use waterfall methodologies for years, we rarely know everything up-front, and our attempts to get it right at first are imperfect.
从多年尝试瀑布模型的经验中我们得出，我们很少能够事先预知所有的事，试图在一开始就做对是不完美的。
As we know from attempting to use waterfall methodologies for years, we rarely know everything up-front, and our attempts to get it right at first are imperfect.
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