If the rocket does not reach this speed, it will fall back to the earth.
如果达不到这个速度，火箭会落回地球。
Rocket Grab pull back speed increased.
火箭铁握收回的速度提高了。
A rocket can bring back information which we could never get in any other way.
火箭能够带回我们用其他方法得不到的资料。
A rocket can bring back information which we could never get in any other way.
火箭能够带回我们用其他方法得不到的资料。
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