Now think of your laptop, thinner than a brown-paper envelope, or your cellphone in the palm of your hand.
现在设想你的笔记本电脑比一个牛皮纸信封或者你手中的手机还薄。
As the young woman reached into a large brown envelope to retrieve the documents, a piece of paper fell out.
当这位年轻女子从棕色的大文件袋中取出有关文件时，一张纸条掉了出来。
In 1985, prove Theorem 1.1 from the point of Brown Motion. This paper USES the method of establishing the convex envelope, giving a proof in Partial Differential Equation.
在1985年从布朗运动的角度证明了定理1.1，本文利用构造凸包络的方法，给出了该定理偏微分上的证明。
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