VOA慢速英语:Another World, Underground: Carlsbad Caverns National Park in New Mexico

1. An elevator lowers you into the world of Carlsbad Cavern, the big cave at Carlsbad Caverns National Park.Silent, except for the voices of guides and visitors.

except for 除了...以外
例句：The composition is quite good except for the spelling.
这篇文章除了拼写以外,其他都不错。

2. The Big Room is more than three hectares big.

more than 多于
例句：Rob likes apples more than bananas. 
罗勃对苹果比对香蕉还喜欢。 

3. BARBARA KLEIN: People are not the only ones who visit Carlsbad Caverns National Park. About four hundred thousand Mexican free-tailed bats come to the big cave from Mexico each summer to give birth.

give birth 分娩
例句：Though a mother give Birth to nine sons, all nine will be different 
一娘养九子九子九个心 

4. I crept between cactus until I lay on the brink of the chasm, and looked down.

look down 轻视
例句：Never look down on people less superior than you. 
千万不要小看地位不如你的人。