的Loss of habitat is to blame, specifically, the lack of the pocket of air between snow and ground called the “subnivean space.” There lemmings winter and give birth to prodigious litters of young.
生存环境的缩小是一个原因，更主要的是它们在冰
和地面之间被称为“
间”里得不到保护，有
旅鼠会在冬天生
人却无法存活的小旅鼠。
