VOA慢速英语:北极濒危动物增加

disturbance- n. something that stops you from working, sleeping, etc.

indigenous - adj. produced, living, or existing naturally in a particular region or environment

marine - adj. of or relating to the sea or the plants and animals that live in the sea

motivate - v. to give (someone) a reason for doing something

pack ice - n. large pieces of floating ice that have come together

route - n. a way to get from one place to another place

tend - v. used to describe what often happens or what someone often does or is likely to do