Scientists say that Enterobacteriaceae are particularly hard to kill because of an outer cell wall that prevents many antibiotics from penetrating.

科学家说肠杆菌特别难消灭，因为它的一个外层细胞壁可以阻止很多抗生素的侵入。

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Determining which industries aren't long for this world may seem easy enough. But some types of businesses, such as telemarketing1, are surprisingly hard to kill.

推断世界上哪些行当不会长久看似容易。但有些行当，比如电话营销，则出人意料地难以消灭。

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It's also an efficient air cleaner and it requires little water, so it's a good, hard-to-kill choice for your desk.

同时它也是强大的空气净化器，只需要一点点的水，所以这是桌面摆设的不二之选。

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It's also an efficient air cleaner and it requires little water, so it's a good, hard-to-kill choice for your desk.

同时它也是强大的空气净化器，只需要一点点的水，所以这是桌面摆设的不二之选。

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