These devices usually use lenticular lenses to project different images in two fixed directions.

这些设备通常都使用透镜镜头，将不同的图像向两个固定的方向投影。

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Once we have a normal map, it's easy to use it to calculate lighting from different directions.

只要我们有了法线贴图，我们很容易使用法线去计算各个方向的光照。

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If you use chlorine tablets or iodine tablets, follow the directions that come with the tablets.

如果你使用氯片或碘片，遵照药片附带的指示使用。

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Recently,a group of experts advised the Food and Drug Administration that the drug needs more controls and better directions for use.

VOA: special.2009.07.21

You can use the "How can I" pattern to ask directions as well.

你也可以用“How can I”句型来询问方向。

How can I 课堂 - SpeakingMax英语口语达人

Last week,a group of experts advised the Food and Drug Administration that the drug needs more controls and better directions for use.

VOA: special.2009.07.08

To make this a super easy process, just use an online directions website such as Google Maps or MapQuest and enter your start and finish addresses.

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"It actually has directions to use for travel, " she says.

BBC: Should parents drug babies on long flights?

Kaiser Permanente, the large managed-care organization, has started a training program for pharmacists that includes confirming the directions for use and stressing the importance of taking medication as prescribed.

WSJ: When 'Use Only as Directed' Isn't Easy