Tumors are notoriously hard to kill.
肿瘤向来以难以清除而臭名昭著。
Once approved, military projects are hard to kill.
而军事项目一旦得到通过，则很难再被撤销。
Though hope is frail, it's hard to kill.
虽然希望渺茫，却难以扼杀。
That's why they're so hard to kill!
这正是它们为什么如此难以消灭的原因！
Though hope is frail, it is hard to kill.
虽然希望是渺茫，也不要放弃。
There can be miracles when you believe, though hope is frail. it is hard to kill.
当你相信的时候，这一定是个奇迹，尽管希望如此脆弱，但也不能轻易扑灭。
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。
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。
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。
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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