The lenses are available in single vision, varifocal and sun-lens forms. They need to be sprayed with a chemical solution every week to keep the fog-repellent surface working.

这种镜片有单光、变焦、太阳镜三种形式，使用时需要每周在镜面上喷洒一种化学溶剂，才能保持防雾表面持续有效。

youdao

The working surface must be nonabsorbent and smooth.

画布应该是光滑的和不吸水的。

youdao

I've barely scratched the surface here, but you now have a working real-world example to build on to expand your expertise.

我在这里仅仅介绍了最浅显的一部分，但是您现在有一个可以工作的现实示例作为基石来扩展您的技能。

youdao

Hurlock is an Air Force employee working at Naval Surface Warfare Center Dahlgren.

FORBES: Unionized Air Force Employee Calls Officer "Ignorant," Keeps Job

Thames Water has also been working on a surface water sewer main in the street.

BBC: Reading Friar Street cracked road surface

But a state highway spokesman says they were only working on the surface of the road, not the underlying structure.

NPR: Minn. Bridge Work Focused on Road Surface