“Coal mines often experience the most serious accidents because so many of them are operating illegally, ” he said. “The industry also sees the most frequent covering-up of accidents.”

“重大煤矿安全事故频频发生是因为其中许多是非法生产的煤矿，”他说，“而且事故时常被隐瞒不报。”

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The United States is the only home many of them have known, but because they were brought here illegally as children by their parents, they live in fear of deportation.

对于他们中的大多数人来说，美国是他们唯一的家，但是由于他们在很小的时候被他们的父母非法携带入境，他们一直生活在会被驱逐出境的恐惧中。

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Take Germany, where foreigners, many of them working illegally, make up a growing share of the workforce in construction.

ECONOMIST: Light on the shadows

Reports say many of them were working in some of the factories housed in the illegally constructed building.

BBC: Bangladesh building collapse death toll passes 700

About 11 million people are in the US illegally, many of them coming across the border from Mexico.

BBC: The human traffic jam