请教大家两道语法题

super_zxyUID: 206844

37. The Louisiana Purchase of 1803 increased the territory of the United States by approximate 846,000 square miles, practically doubling the area of the United States.

答案是approximate.为什么?approximate不是修饰square miles么?难道要改为adv修饰全句?


31. The spice cinnamon and the drugs cascara and quinine all come from bark, the
protective out layer of stems and roots of woody plants.
答案是out.为什么?不是修饰layer么?

谢谢大家

mwhUID: 201249

37，改为approximately，修饰全句
31，改为outer形容词

super_zxyUID: 206844

out也是形容词啊

mwhUID: 201249

对，out是有形容词的词性，但它的用法不是这样。
参看朗文中的解释：
[not before noun]
1
no longer fashionable
ￚopposite inYou can't wear that - maxi skirts have been out for years.
2
especially American English if a machine, piece of equipment etc is out, it is not working
I don't believe it the elevator's out again!
ￚsee also be out of order atorder1 (8)