* The safety and the speed of the internet are what matters.

因特网的安全性和速度才是最重要的。（what引导表语从句，what在该从句中作主语）

* You can decide what resolution and compression level is best for your output.

你可以选择所谓的分辨率和压缩率水平来达到你的最佳效果。（what引导宾语从句，what在该从句中作定语）

3. 在what引导的名词性从句（多数为主语从句）中，这时what可译为相应的名词。 如：

* What a motor does is to change electrical energy into mechanical eneray.

马达的作用就是将电能转换成机械能。（what引导主语从句，what在该从句中作宾语）

* What the TV camera does is to break the picture up into a number of lines consisting of very small points of light.

摄像机的功能就是把图像分解成许许多多由微小光点组成的线条。（what引导主语从句，what在该从句中作宾语）

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