Rough as a saw edge, and hard as whinstone!
像锯齿一样地粗，像岩石一样地硬！
His smile faded as he explained, and a hard edge crept into his voice.
他解释着，嘴角的笑意有些黯淡，某种生硬的味道在他的语气中蔓延开来。
Trading at the right edge is hard because the noise level is high.
正确交易很难，因为噪音太大。
I think that: must be hard with the knife's edge.
我认为：必须把勤奋用在刀刃上。
You feel like you're on the edge of something that is hard to comprehend.
你会感觉好像站在一种难以理解的东西的边缘。
They're sitting on a knife's edge, and it's a very hard place to be.
他们就像座在火山边沿，这是个非常危险的地方。
They're sitting on a knife's edge, and it's a very hard place to be.
他们就像座在火山边沿，这是个非常危险的地方。
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