这是一件棘手的事。
Let me tell you, that's a tough proposition.
让我告诉你，这是一个艰难的命题。
Wolves are our next opponent and we know it's a tough proposition.
狼队是我们的下一个对手，我们知道比赛很艰难。
Life's a tough proposition, and the first hundred years are the hardest.
生命是道难题，尤数头一百年最是辛苦。
Even among seasoned mountaineers Pinnacle Ridge is considered quite a tough proposition.
即使在经验丰富的登山者中，平纳克尔峰也被认为是很难攀登的。
Simply don't upload them to the web, ever, because trying to delete them after you sober up is a tough proposition.
千万不要上传到网上，因为等你清醒后，要想删就难了。
But substituting toxic battery components for gentler ones isn't always an equal energy trade-off, which is a major reason why creating "green batteries" is a tough proposition.
但是，作为其中一个替代有毒电池的成分，并不是任何时候都可以和原来的成分同等替换的。这就是创造“绿色电池”是个很棘手的问题的重要原因。
But substituting toxic battery components for gentler ones isn't always an equal energy trade-off, which is a major reason why creating "green batteries" is a tough proposition.
但是，作为其中一个替代有毒电池的成分，并不是任何时候都可以和原来的成分同等替换的。这就是创造“绿色电池”是个很棘手的问题的重要原因。
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