Whether in a controlled or natural environment, the light source is an essential consideration.

无论是在人工控制还是自然条件下，光源都是个必要考虑因素。

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The light version of the library is distributed only as source, and that restriction might be an issue if you try to install it in a hosted environment.

PDFLib 库的精简版本库仅作为原始版本分发，当您尝试在托管环境下安装精简版本时，就会出现这个限制问题。

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Based on the standard of environment light source requirement in the photoelectric proximity switch tests, and the practical tests complied with this standard, the judgement difference was presented.

基于光电式接近开关所有试验条件中环境光源要求部分标准的制定，以及实际的根据标准进行试验结果判定的差异性。

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Called Paperwhite, the new model has a black and white screen and comes with a light source which enables reading in a dark environment.

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