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| 1. | the Torrid Zone); it may also be an area with strictly defined, often arbitrarily set boundaries ( |
| 热带)；它也可是一个严格定义的区域，常常随意设制边界（ |
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| 2. | The maximum permissible transmittance level of the filter at a given wavelength can be arbitrarily set |
| 滤镜的最高允许透光量,可设定为"极限比例"的百分之1至0.1之间,以提供一个安全系数. |
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