be willing to 乐于; 甘于

　　例句：People may even be willing to die for their pets.

　　甚至有人愿意为宠物献出自己的生命。

　　be able to 能，会; 能够

　　例句：How soon will china be able to clean up its air?

　　中国能在多短时间内将空气变清洁?

　　4. At least one terrorism expert has noted stronger ties between the Islamic State and the group called al-Qaida in the Arabian Peninsula.

　　at least 至少

　　例句：At least she is a paragon with her feet on the ground.

　　她至少是一个脚踏实地的特殊人物。

　　5. But other experts believe it is too soon to talk about threats to the U.S.

　　too ... to 太...导致

　　例句：Its too early to tell.

　　现在做判断还为时过早。

　　6. He adds that such attacks are much more difficult to carry out than most people realize.

　　carry out 执行; 进行

　　例句：They should also carry out some fundamental reforms.

　　这些政府也应该执行一些基础性的改革。

　　7. It takes people who understand how to deal with masking their identities, with exercising a great deal of communications security and other aspects of operational security.

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