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safety of flight
 safety of flight
avia. 飞行安全
| test
 test
gen.
archit. 试 验; 测验; 检査; 准则; 试验品; 试验方法
auto. 检 验

to phrases
safety of flight
avia. 飞行安全
safety of flight: 10 phrases in 2 subjects
Aviation8
General2