难点问题
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difficult point problem
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But today's problem of non-point source pollution is more difficult to control.
CNN: Polluted rivers stain Portland's image
But if we keep kicking the can down the road, the problem just keeps getting worse, and then at some point it will be very difficult to deal with because the consequences will be so painful.
CNN: World faces a day of financial reckoning
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