The unit personalities and intractability add a whole new depth to a game that may not be recognized on the surface, but for one reason or another keeps us coming back for more.

游戏单位的个性化设计和独特性给游戏增添了全新的深度，它也许不会被大家一眼所认出，但是却能够使我们回味无穷，让我们欲罢不能。

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And the way it will work is that you have to choose an orientation of a surface, which just means choosing one of the two possible unit normal vectors.

具体方法是，先给曲面定向，也就是选择两个单位法向量中的一个。

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The pigeon-hole unit is available as an option and can be placed directly on the surface of the desk or wall mounted as shown.

上面的“鸽子洞”储物格可以直接放在桌子表面，也可以挂在墙上。

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The Barclays analyst chopped his forecast for December quarter Surface unit sales to 700, 000, from 2 million.

FORBES: Microsoft: Barclays Cuts Ests On Weak PCs, Slow Surface Ramp

Microsoft has set expectations on the Surface unit in a number of ways (such as pricing, which I discussed yesterday), but the expectation generated with consumers does not seem to be matching up with reality.

FORBES: Microsoft Has A Problem With The Public's Expectation Of The Surface

Coal mining accounts for 90% of sales at Joy's underground division and 33% at its surface-mining unit (copper and other ores account for the rest).

FORBES: The Big Dig