A hydrogen explosion had also occurred earlier at reactor 2. That brings the number of crippled units to four of the plant's six reactors.
2号反应堆此前也发生过氢气爆炸，这意味着核电站6个反应堆中受损数量升至4个。
2
For the crew of a spacecraft ramping up to light speed, interstellar space would appear highly compressed, thereby increasing the number of hydrogen atoms hitting the craft.
对宇宙飞船的船员来说，速度升高到光速，宇宙空间将被高度压缩，因此增加了撞击飞船的氢原子数量。
3
Any simple alcohol is composed of a number of carbon and hydrogen atoms (like a hydrocarbon such as petrol) together with a single oxygen atom.