飞机在起落区上空盘旋。
某型飞机前起落架后接头连接区为疲劳危险部位，必须准确地估计疲劳寿命。
The joint pontes of the front undercarriage of an aircraft is a fatigue critical part, its fatigue life has to be estimated exactly.
某型飞机前起落架后接头连接区为疲劳危险部位，必须准确地估计疲劳寿命。
The joint pontes of the front undercarriage of an aircraft is a fatigue critical part, its fatigue life has to be estimated exactly.
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