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.
“杀死兰花是非常困难的！”花卉和植物协会的女发言人说，她让我说出是什么原因杀死了兰花。
"It's very hard to kill an orchid!" said a spokeswoman from the Flowers and Plants Association, making me out to be some sort of orchid murderer.
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.
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