Words and expressions in each unit

stubborn adj.顽固的；固执的organize vt.组织；成立care about 关心；忧虑；惦念detail n.细节；详情source n.来源；水源determine vt. 决定；确定；下定决心 determined adj. 坚决的；有决心的change one´s mind改变主意journey n.旅行；旅程altitude n.海拔高度；高处make up one´s mind下决心；决定give in 投降；屈服；让步atlas n. 地图；地图集glacier n.冰河；冰川..