No mechanical devices are used in passive heating systems.
被动的加热系统中没有用到机械装置。
With the advent of projection, the viewer's relationship with the image was no longer private, as it had been with earlier peepshow devices.
"随着投影的出现，观众与图像的关系不再像早年使用西洋镜设备时那样私密。
Your home colleagues—your family—have no clear rewards for their labor; they need to be talked into it, or if they're teenagers, threatened with complete removal of all electronic devices.
你家里的同事——你的家人——他们的劳动也没有明确的回报；他们需要被人说服，如果他们是青少年，要用没收全部电子设备来威胁他们。
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