候鸟每年沿固定路线迁徙,气候异常会打乱它们的节奏。Hòuniǎo měi nián yán gùdìng lùxiàn qiānxǐ, qìhòu yìcháng huì dǎluàn tāmen de jiézòu.Migratory birds follow fixed routes each year, and abnormal climate conditions can disrupt their rhythm.
每到秋天,天鹅就从北方迁徙到温暖的湖边过冬。Měi dào qiūtiān, tiān'é jiù cóng běifāng qiānxǐ dào wēnnuǎn de hú biān guòdōng.Every autumn, swans migrate from the north to warm lakesides to spend the winter.
历史上这个游牧民族曾多次迁徙,寻找新的草原。Lìshǐ shàng zhège yóumù mínzú céng duō cì qiānxǐ, xúnzhǎo xīn de cǎoyuán.Historically, this nomadic people migrated many times in search of new grasslands.