This is a dangerous game: by the 100 percent of the evidence is in, it may be too late. With the risks obvious and growing, a prudent people would take out an insurance policy now.
【析句】by the 100 percent of the evidence is in 实际上的意思是by the time when the 100 percent of the evidence is in，即by
the time when we have the 100 percent of the evidence。
答案：
这是一个危险的游戏：等有了百分之百的证据，也许就太晚了。随着风险越来越明显并且越来越大，一个谨慎的民族现在应该准备一份保单了。
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