战国时代发明了可以双箭齐射的连弩，提高了发射速度。
Repeating crossbow which could launch two arrows at a time was invented during the Period of Warring States.
但是，如果有一把发射速度很快的弓，你足可限制怪物快速推进。
If you fire continually with a fast bow, you may find, however that this is enough to keep a monster from moving very far.
第一宇宙速度两个别称：航天器最小发射速度、航天器最大运行速度。
The first two speed of the universe another name: the smallest space launch speed, maximum speed of the spacecraft.
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