The author thought that, Only in the migration birds have such randomcarrier, they may freely fly to Earth's each quoin.
只有迁移中的鸟类具有这样的随机性载体，它们可以自由地飞行到地球的每一个角落。
Seasonal migration is another form of escape, especially for large mammals or birds.
季节性迁徙是另一种逃避方式，特别是对大型哺乳动物或鸟类来说尤为如此。
When the planetarium sky matched the sky outside, the birds fluttered in the direction of their normal migration.
当天文馆的天空与外面的天空相匹配时，鸟儿们就朝着它们正常迁徙的方向飞翔。
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