In the U. S., where there are 23 similar reactors operated by 11 different companies, backup generators typically are housed in bunker-like buildings at ground level.

在美国，有11家不同的公司运营着23个类似的反应堆，备用发电机通常放置在处于地面水平的类似于防空洞的建筑中。

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On March 19, 2003, U.S. missiles and bunker-busting bombs dropped by air struck targets inside Iraq, paving the way for a ground invasion by U.S.-led forces the next day that eventually overthrew President Saddam Hussein's regime on April 9.

WSJ: Wave of Deadly Attacks Hits Baghdad

Israel has large bunker-buster bombs but the U.S. hasn't provided the MOP to any other country.

WSJ: Pentagon Seeks Mightier Bomb vs. Iran