选择一个尽可能的的最低吸收率设备（SAR=Specific Absorption Rate，是一个人体吸收磁场强度的计量单位）。

Choose a device with the lowest SAR possible (SAR = Specific Absorption Rate, which is a measure of the strength of the magnetic field absorbed by the body).

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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。

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.

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按照结构化信息原则，您决定不把菜量和度量单位放在一个属性中，而是使用一个元素，于是选择以下格式。

Following the Principle of structured information you decide not to shoehorn the portion measurement and units into a single attribute, but instead of using an element, you opt for.

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