A threefold cord is not quickly broken.
股拧成的绳子不易断。
倍(的)
的,重的A threefold cord is not quickly broken.
股拧成的绳子不易断。
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).
的目的，
舱壁是个方面：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 （讨论以较早者为准） 。
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