1. X represents the unknown. X. 
   表示未知数。
2. Chapter X Supplementary Provisions 
   第十一章附则
3. If x is positive then-x is negative. 
   假如x是正的，那么－x是负的。
4. Rossiter was lost at that place. They didn't know how to appreciate him, or his work. He was just too big a man for the position, in fact a triton among minnows. 
   罗西特在那个地方显示不出自己的才能。他们不懂得赏识他和他的工作。其实他担任那一职务，才力绰绰有余，有如鹤立鸡群。
5. it means 1.39 x 10-47. 
   它真正的含义是“1.39×10的-47次方”。

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