在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。

The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.

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他说“两只小白鼠最后在真实的零重力条件下做了试验，并拍成了录像，但是考虑到非常敏感，美国宇航局只提供了剪辑版。”

Two guinea pigs then tested them in real zero-gravity conditions. The results were videotaped but are considered so sensitive that even Nasa was only given a censored version.

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未连接的输入应被放入某个单独的输入条件，或是标记为可选，即把它们的最小增殖次数设置为零，以允许执行流程。

The disconnected inputs must be either put into a separate input criterion or marked as optional by setting their minimum multiplicity to zero to allow the process to execute.

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So even though we think of conditions as being Boolean values true or false, really underneath the hood true means anything other than zero.

即使我们考虑,布尔值的真假条件，在底层“真“表示非零。

哈佛公开课 - 计算机科学课程节选