The helicopter should be inverted as it passes in front of the pilot.
当直升机到达操控者的正前方时，机体刚好成为倒飞的姿态。
And, child safety sit chair should not be kept in front of the co-pilot position.
并且，儿童安全坐椅不应放在前排副驾驶位置。
The Safety valves pilot valve plunger driven in front of mouth;
其导阀口前面有导向柱塞；
The Safety valves pilot valve plunger driven in front of mouth;
其导阀口前面有导向柱塞；
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