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Lesson 17
第17課
deafen
v.使聾
A sudden explosion deafened us for a moment.
突然的爆炸聲使我們耳聾了一會兒。
compel
v.強迫
He was compelled by illness to give up his studies.
他因病被迫放棄學業。
amuse
v.使笑
The storyteller's jokes amused the children.
說書人的笑話逗樂了孩子。
waterfall
n.瀑布
The Niagara Falls is one of the most beautiful waterfalls in the world.
尼亞加拉瀑布是世界上最美麗的瀑布之一。
straw
n.稻草
The farmers covered the barn floor with straw .
農民們把稻草覆蓋在谷倉的地板上。
rare
adj.稀有的，半熟的
These flowers are very rare in this country.
這些花在這個國家很少見。
preserve
v.保存
The park was created to preserve some of the forests upstate.
這個公園是為了保護該州最北部地區的一些森林而建的。
motive
n.動機
There seemed to be no motive for the murder.
這起謀殺案看不出有什么動機。
oral
adj.口頭的
He passed his German oral exam.
他通過了德語考試。
frost
n.霜
The car window was covered with frost.
車窗玻璃結了霜。
pre
放在詞根前表示“先于，在...之前”
preheat
預熱（pre+heat預熱）
precaution
預防（pre+caution預防）
pre-war
戰前（pre+war戰前）
