The PLA Navy will need to overcome several large obstacles before it can field an operational aircraft carrier and associated supporting ships.
海军将需要克服一些障碍，才能场大型航空母舰及相关业务辅助舰艇。
2
The breaking strength of PTT and PLA fibers decreased after ultrasound radiation, but the degree of strength lost not large and still meet the need of fibers.