举例来说，如果现在是教授微积分的第一个星期，你可能会记录我上面提到过的导数方程。
For example, if it's the first week of calculus, you might record the standard derivative equation I reproduced above.
首先考虑第一个分量，求出它关于x的偏导数。
Ry-Qz Well, so we have to take the first component, Ry minus Qz, and take its partial with respect to x.
这使PXE服务器能够知道(在启动时)从第一个网络引导数据包的客户端的确切的体系结构。
This enables a PXE server to know (at boot time) the exact architecture of the client from the first network boot packet.
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