One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure.
误差的一个来源是折射，即光束通过不同温度和压力的空气层时发生的弯曲现象。
2
In the ENTR 'acte there was a current of chill air in Ellen's box, the door was opened, and Anatole walked in, bending and trying not to brush against any one.
幕间休息时，海伦的包厢里有一阵袭人的寒气，门打开了，阿纳托利弯下身子，尽力不挂着别人，走了进来。
3
Instrument air tubing shall be 316 stainless steel. The tubing shall be seamless and suitable for bending. The fittings shall be suitable for the selected tubing.