如果爆炸距离较远，爆炸产生的冲击波会在30秒左右到达。
If the explosion is some distance away, it could take 3 0 seconds or more for the blast wave to hit.
如果为了保证效果而使爆炸距离太近，到时候地球可能会被很多爆炸碎块击中，就不是单单一个小行星的问题了，这样反而会使破坏范围扩大。
If you explode too close to impact, perhaps you ' ll get hit by several fragments rather than one, so you spread out the area of damage.
他所处位置距离爆炸中心两英里，这里下起一阵“碎片雨”——燃烧的纸片和衣服碎片。
He was two miles from the epicentre of the blast, in a rain of flaming scraps of paper and clothes.
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