词A threefold cord is not quickly broken.
三股拧成
绳子不易断。
),三重A threefold cord is not quickly broken.
三股拧成绳子不易断。
The purpose of the bulkhead is threefold: to seal the forward end of the motor, to retain the pyrogen igniter, and to act as a blowout plug in case of motor overpressurization (discussed earlier).
目，
舱壁是三个方面：密封着年底汽车，保留热原点火器，并充当井喷堵塞在案件电机overpressurization （讨论
较早者为准） 。
声
：
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