名詞 forty:

1. the cardinal number that is the product of ten and four
   同義詞：40, XL

形容詞 forty:

1. being ten more than thirty
   同義詞：40, xl, twoscore

1. They managed to squash forty people into the bus.
   那輛公共汽車好不容易塞進(jìn)了四十個(gè)人。
2. This piece of furniture is really inexpensive with a price of less than forty dollars.
   這件家具還不到四十美元，實(shí)在不貴。
3. He reigned over the country for forty years.
   他統(tǒng)治了這個(gè)國(guó)家四十年。
4. He is near forty.
   他年近四十。
5. He took the ninth position in his class of forty.
   他在40 個(gè)人的班級(jí)里排第九名。
6. Perhaps I am wrong, but I think she is near forty.
   也許我錯(cuò)了，但是我想她快四十歲了。
7. The atlas contains forty maps.
   這個(gè)地圖集有四十幅地圖。
8. His hair became gray when he was only forty.
   他剛剛四十歲時(shí)，頭發(fā)就變得灰白了。

for.ty

n.（名詞）
【復(fù)數(shù)】 for.ties
The cardinal number equal to 4 × 0.
四十：一個(gè)基數(shù)，為4和0的乘積
forties
forties
Often Forties The decade from 40 to 49 in a century.
常作 Forties 四十年代：一個(gè)世紀(jì)中從40年到49年的十年
A decade or the numbers from 40 to 49:
四十幾：四十年到四十九年的十年，四十到四十九：
例句：
They stopped smoking in their forties. At night the temperature fell into the forties.
他們?cè)谒氖畮讱q時(shí)戒了煙。晚上，溫度降到四十幾度

來(lái)源：
Middle English
中古英語(yǔ)
from Old English fôowertig * see k wetwer-
源自 古英語(yǔ) fôowertig *參見(jiàn) k wetwer-

【引伸】
for.ty
adj.（形容詞）
pron.（代詞）