51A造句怎么写

4、X-51A起动超过200秒，促使飞行器速度提高到音速的五倍。

2、More X-51A flights are expected as early as this fall.

1、TEST 51A CONTINUED FROM THE PREVIOUS PAGE.

3、The X-51A burned for more than 200 seconds and accelerated the craft to five times the speed of sound.