冻土 | dòng tǔ | frozen earth / permafrost / tundra | |
冻土层 | dòng tǔ céng | permafrost / tundra / layer of frozen soil | |
小天鹅 | xiǎo tiān é | (bird species of China) tundra swan (Cygnus columbianus) | |
短嘴豆雁 | duǎn zuǐ dòu yàn | (bird species of China) tundra bean goose (Anser serrirostris) |