看图记单词 139

9. precipice

/ˈpresəpɪs/

a very steep side of a high rock, mountain, or cliff
悬崖，峭壁

10. foothill

/ˈfʊthɪl/
one of the smaller hills below a group of high mountains
山麓丘陵

11. snowline

the level above which snow on a mountain never melts
雪线

12. ice

water that has frozen into a solid state
冰

13. source

/sɔːrs/
the place where a stream or river starts
（溪流的）发源地

14. waterfall

a place where water from a river or stream falls down over a cliff or rock
瀑布

15. forest

a large area of land that is covered with trees
森林，林区

16. lake

a large area of water surrounded by land
湖，湖泊