相对来说核事故的危险性要小的多，但是一旦发生，就是非常严重的事故。
The risks of a nuclear accident are small in comparison. But when one of them happens, it does so big time.
鉴于2003年发生的哥伦比亚事件的惨剧仍记忆犹新，NASA预备了奋进号航天飞机作为后援，一周内一旦亚特兰蒂斯号发生任何危险，奋进号将立刻进行救援。
With the 2003 Columbia tragedy in mind, NASA will have the shuttle Endeavour prepared to rescue the Atlantis crew from space on a week's notice should any mishaps occur.
这种情况很少见，但是一旦发生，对于母亲和婴儿来讲是非常危险的。
This is very rare, but when it does happen, it can be very serious for both the mother and the baby.
消防重点部位是指火灾危险性大，一旦发生火灾职员伤亡大、损失大的，有可能影响整个酒店的经营的重要部位。
The fire security important section is the very important place, where will effect the operation of the whole hotel and lead people to hurt or dead, and destroy huge properties once the fire happens.
但有的研究者警告说，虽然病原体逃逸的危险很小，但一旦发生，后果将是灾难性的。
But some researchers warn that while the risk of the pathogen escaping is small, the consequences could be catastrophic.
而一旦发生个别董事或者高管故意去损害或者侵占公司或者股东的利益，则会非常的危险。
If some of them intentionally damage or take over interests of the company or shareholders, it would be quite dangerous.
这种汽车一旦发生事故将会非常危险。
地下二氧化碳一旦发生大量泄漏，就如同核燃料泄漏一样危险。
A large leak of underground carbon dioxide could be as dangerous as a leak of nuclear fuel.
鉴于2003年发生的哥伦比亚事件的惨剧仍记忆犹新，NASA预备了奋进号航天飞机作为后援，一周内一旦亚特兰蒂斯号发生任何危险，奋进号将立刻进行救援。
With the 2003 Columbia tragedy in mind, NASA will have the shuttle Endeavour prepared to rescue the Atlantis crew from space on a week 's notice should any mishaps occur.
园区消防安全始终是物业公司关注的重点，高层楼宇一旦发生火灾极其危险，造成的严重后果将不堪设想。
The fire safety always been an important and focus issue. It will cause unimaginable serious consequence once a high building on fire.
但是因为不再发生光合作用，它们将多余的能量给了氧分子，此时氧分子一旦被激发会发生危险反应。
But with no photosynthesis happening, they end up passing the unused energy along to oxygen molecules, which become dangerously reactive when energized.
危险品在运输过程中，存在着巨大的潜在危险性，一旦发生事故，将造成严重后果。
There is a huge potential risk during transport of dangerous goods, which could cause serious consequences in the event of an accident.
特种医疗设备危险性较大，一旦发生事故，会涉及到医患人员的生命安全。
Pressure vessel is used in medical organization as a kind of special medical equipment.
特种医疗设备危险性较大，一旦发生事故，会涉及到医患人员的生命安全。
Pressure vessel is used in medical organization as a kind of special medical equipment.
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