Migration – 迁徙

Environment – 环境 / Big problem – 大问题 / Global warming – 全球暖化 / Pollution – 污染 / Weather changing – 天气变化 / On the verge of extinction – 濒临灭绝 / Consequence – 后果 / To protect – 保护 / To destroy – 摧毁 / Ozone layer – 臭氧层
 / Endangered animals – 濒危动物 / Migration – 迁徙 / Flood – 水灾 / Hurricane – 飓风 / Earthquake – 地震

Migration – 迁徙