This article described the DPTK expression language and demonstrated how it can be applied to create an effective way of accessing your data model.

本文介绍了DPTK表达式语言，并演示了如何使用它创建访问数据模型的有效方法。

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So, no matter how you say it, this is always zero. So, in a way, this reinforces our intuition that del, even though it's not at all an actual vector sometimes can be manipulated in the same way.

因此，无论你怎么描述它，它总是0，那么在某种程度上，这加强了我们的直觉，即▽有时也可以用同样的方式计算,即使它并不是真正的向量。

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If you're curious about how Android works and would like to try it out on a real machine, this is a great way to see how fast a mobile OS can be on a netbook or desktop.

如果你对Android很好奇，并想在电脑上尝试一下，那么这是一个见证移动操作系统运行在上网本或桌面电脑上的绝好方式。

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"If this is how Iraqis are comfortable with it, if this is the way our side thinks it can be done best, then frankly the ownership is less important than the reality of helping them fighting the enemy, " the senior defense official said.

WSJ: CIA Ramps Up Role in Iraq