在我的职业生涯中，我跟很多的旅行社、旅游批发商、协会以及在线旅行社合作过。他们当中有的很好合作，有的就非常困难。
In my career, I partnered with many travel agents, tour wholesalers, consortia, and OTA's; some easy to work with, some not so easy.
国际航空运输协会说，2009年看来将会成为世界航空业有史以来面对的最为困难的年度之一。
The International Air Transport Association says 2009 is shaping up to be one of the toughest years the airline industry has ever faced.
美国肺脏协会指出，判断婴儿和学龄前儿童何时会患流感可能尤其困难。
The ALA notes that it may be particularly difficult to tell when infants and preschool age children have the flu.
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