They also lack the powerful muscles which allow birds to beat their wings.

他们还缺少鸟类用以振翅的强健肌肉。

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Summer is a fabulous time for taking a birding field trip, and the best birders know how to take advantage of summer birding and beat the heat at the same time without endangering the birds.

夏季时进行野外观鸟的绝佳时间，而最好的观鸟者知道怎样在夏季不危害鸟类的同时来观鸟和降温防暑。

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Birds fly very easily. They beat the air with their wings and climb up through the air. Then they spread their wings and float on the air.

鸟儿轻而易举地就飞起来了，它们用翅膀拍打着空气，穿过空气上空，展翅飞翔。

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Harrison suggests adding shady areas so birds, bunnies and pets can beat the heat.

CNN: Make your garden pet-friendly

Earlier this year, Venture Beat reported that two veteran managers who were crucial to the development of Angry Birds had left to start their own game studio, Boomlagoon.

FORBES: Another Angry Birds Manager Flies The Nest