沙丘鹤在长途航行中休息

migration - n. to move from one area to another at different times of the year

perfect – adj. having all the qualities you want in that kind of person, situation

binoculars - n. a device that you hold up to your eyes and look through to see things that are far away

trip – n. a journey to a place

leftover – adj. a thing that remains after something is finished or ended

dandelion – n. a very common wild plant that has bright yellow flowers; when its seeds form, they fly away like tiny parachutes

bond­ - v. to form a close relationship with someone

all of a sudden – adj. suddenly

collective – adj. involving all members of a group