有些井是露天的巨坑，每个斜边都有几百级台阶，通常是一层一层的。

Some wells are vast, open craters with hundreds of steps paving each sloping side, often in tiers.

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3D 打印机用液体塑料来建造物体，他们一层一层地建造着物体，直到完成。

3D printers are used to build an object with liquid plastic. They build the object layer by layer until it is complete.

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你慢慢一层一层地剥去洋葱皮。

You gradually shed layer after layer after layer.

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So, hedge funds do not advertise, that's why people don't know about them and they have a mysterious -they sound mysterious.

对冲基金公司做不了广告,那也是公众并不了解他们的原因,他们披着一层神秘的面纱...,他们听起来挺神秘的

耶鲁公开课 - 金融市场课程节选

If I were to hold up two pieces of paper, there's a sense in which they are participating in "Twohood."

如果我拿起两张纸,便有这样一层含义,即,这两张纸分有了 二性

耶鲁公开课 - 死亡课程节选

When I started merging, I did merging three times across this whole board, this level, this level, and this level, and each time because of the way I was advancing my fingers I touched each number just once.

在整个过程中，我一共做了,三次合并，这一层，这一层，和这一层，而且每次,由于要前移手指，因此对每个数字,仅仅移动了一次。

哈佛公开课 - 计算机科学课程节选