visibility effect
可见性效应
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The operator should use an independent risk evaluator for weather and other environmental conditions like volcanic ash or even heavy pollutants which can effect helicopter operation and pilot visibility.
FORBES: 10 Essential Checks Before You Step Into A Helicopter
应用推荐
模块上移
模块下移
不移动