鸟儿怎样飞行？How Do Birds Fly?
鸟儿有四种不同的飞行方式。
鸟儿能振动翅膀、高飞、滑翔和盘旋。
许多鸟都是通过振动翅膀来飞行的。
大型捕食鸟儿在暖气流上飞翔。
他们滑翔的时候不需要振动翅膀。
There are four different ways of flying.
Birds can flap their wings, soar, glide or hover.
Many birds fly by flapping theirs wings.
Large birds of prey soar on drafts of warm air,
They do not need to flap their long wings while soaring.
大的海鸟，如漂泊信天翁，在海洋上空滑翔。
有的鸟，如蜂鸟，为了保持在一个地方必须不停地快速拍打翅膀。
我们称之为盘旋。
Large sea birds, such as the wandering albatross, glide over the sea.
Some birds, such as the hummingbird,beat their wings very fast to stay in one spot.
This is called hovering.
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