This estimate was alarming; it was the first time an asteroid had been promoted to "Level 4" on the Torino Scale -- a near-Earth object (NEO) impact hazard categorization method.

这样的预测令人担忧，这是在评价近地天体（NEO）撞击危险程度的 “托里诺分类表”（THE TORINO IMPACT HAZARD SCALE）中第一次有小行星进入“4级”（译注：该分类表最高为10级）。

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The US insisted at the time that it undertook the operation to prevent the satellite returning to earth with a toxic fuel tank which would pose a health hazard.

美国人强调这次导弹试射是为了防止带有毒性气体罐的会对公众健康有威胁的卫星返回地面。

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Always make sure your barbecue pit is free from any coal, which can pose a serious hazard when you work with it the next time.

总是要确认你的烧烤器具远离煤炭，不然你下次使用的时候就会有严重的安全隐患。

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The ball went out of play and, when a ball boy took his time retrieving it, Hazard went to fetch it himself.

CNN: Eden a Hazard to Chelsea's public image?

Chelsea needed to score twice to take the game into extra time and it appeared Hazard lost his patience with Mr Morgan after the ball had gone out of play for a goal-kick.

BBC: Swansea ball boy: Police continue to investigate

Chelsea needed to score twice to take the game into extra time and it appeared Hazard lost his patience with the youngster after the ball had gone out of play for a goal kick.

BBC: Swansea ball boy Charlie Morgan tweets 'crazy 24 hours'