该协会还表示，必须提高机组人员和空中交通管制员的培训标准，因为空中交通越来越拥挤。

The association also said that standards of training must be raised among flight crews and air traffic controllers as the sky has become ever more crowded.

youdao

该协会还表示，必须提高机组人员和空中交通管制员的培训标准，因为空中交通越来越拥挤。

The association also said that standards of training must be raised among flight crews and air traffic controllers as the sky has become ever more crowded.

youdao