He described the vernal migration of birds in detail.
他详细地描述了鸟的春季移居。
Such tall buildings, a conservationist there protested, would interfere with the night migration of birds, which would bang into the unexpected obstructions.
有一位环保主义者认为，大楼如此之高，将会危及喜欢夜间迁徙的鸟类安全，因为飞鸟完全可能“砰”地一声撞在冷不丁出现的障碍物上。
Bird banding is one of the important means to research the seasonal migration of birds, and is an effective method in researching the faunas, ecology and morphology of birds.
环志是研究鸟类季节性迁徙的重要手段之一，同时也是研究鸟类区系、生态学、形态分类学等的有效方法。
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