当HTP接触到火箭发动机内的催化剂时，就转变成气体和氧气。
When the HTP comes into contact with a catalyst contained within the rocket, it turns into steam and oxygen.
日本官员说，正是被释放的蒸汽包含的可燃氢气在接触到大气中的氧气后，导致了那次爆炸。
The venting process triggered the explosion when combustible hydrogen released by the steam mixed with oxygen in the air, officials said.
被植入的细胞需要与血液接触才能感知血糖变化对对此做出反应，也才能获取细胞存活所需的氧气。
The implanted cells need access to blood in order to sense and respond to changes in blood sugar, as well as to deliver the oxygen the cells need to survive.
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