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。
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。
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.
仪表空气管线应该使用316不锈钢管。管线应为无缝管并且易于弯曲。接头应适用于所选的管线。
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