TOEFL vocabulary（1）

timberline
n. 树木线 the upper limit of arboreal growth in mountains or high latitude
tree line 树带界限，林线
There was a cool spring above the timberline.
林木线以上有一股清凉的泉水。

transition
n. 过渡，转变 changing from one state or condition to another
transitional adj. 变迁的，过渡的
alteration n. 变更，改变
changeover n. 转变，改变，更换
The transition from city life to the farm life is often very difficult.
从城市生活向乡村生活过渡通常很难。

dramatic
adj.戏剧的，激动人心的 of drama; exciting or impressive
dramatically adv. 戏剧地，引人注目地
striking adj. 突然的，惊人的
That policy has led to a dramatic increase in their prison populations.
那项政策已经让他们监狱的囚犯人数剧增。

vertical
adj. 垂直的，竖立的 going straight up or down
vertically adv. 垂直地
verticality n. 垂直性
perpendicular adj. 垂直的，直立的
upright adj. 垂直的，笔直的
The western side of the mountain is almost vertical.
这座山的西坡几乎是垂直的。

disappear
v.不见，消失 to become impossible to see
vanish v. 消失
The rumor has to disappear before facts.
在真相面前谣言不得不销声匿迹。

moist
adj. 微湿的，湿润的 slightly wet
moistly adv. 潮湿地
moistness n. 湿
damp adj. 潮湿的
humid adj. 潮湿的
His eyes were moist.
他眼睛泪汪汪的。

tropic
adj. 热带的 of or relating to the tropics
tropic of Capricorn 南回归线
tropic of Cancer 北回归线
torrid adj. 酷热的
Her home town is located in the north to the tropic of Cancer.
她的家乡在北回归线以北。