以下为句子列表：
英文: A one-kilogram chunk of matter converted completely to energy—this is a working definition of a 20-megaton hydrogen bomb.
中文: 一公斤大小的物质完全转化为能量──这正是一颗2000万吨氢弹的实际定义。
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英文: For example, a one-megaton nuclear warhead would need to be intercepted at an altitude of at least 10 kilometers to prevent the city from being incinerated by the heat of the hydrogen bomb.
中文: 举例来说，一枚百万吨级的核子弹头，必须在10公里以上的高空拦截，城市才不致于因为氢弹的热度而化为灰烬。
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