There are just two hydrogen atoms per cubic centimeter on average in space, which poses no threat to spaceships traveling at lowspeeds.
太空中平均每立方厘米只有两个氢原子，这对低速飞行的宇宙飞船不构成威胁。
2
The neutrons are created in a fission reactor, and slowed to incredibly lowspeeds by materials known as moderators.
这些中子从核反应堆中产生，在减速剂的作用下减到难以置信的低速。
3
This afternoon the First Sea Lord, Admiral Sir Jonathon Band, issued a statement saying the two vessels hit each other while travelling at very lowspeeds and no one was injured.