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.

• 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。