Rather than teach the cranes to stop landing on him, the trainer taught the birds something else, a behavior that would make the undesirable behavior impossible.
驯兽师不是教鹤不要停在他身上,然而是教它别的行为,这样一来就能避免不被期待的举动发生。
Airlines are reluctant to stop them because airport operators often use sales of duty-free and other items to subsidise landing charges.
航空公司不情愿阻止他们,因为机场运营管理商通常用免税产品和其它商品的销售额来抵充所收取的机场降落费。
我们如何才能阻止他们登陆呢?
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