occasional, uncommon, scare, rare

形容詞 rare:

1. not widely known; especially valued for its uncommonness
2. recurring only at long intervals
3. not widely distributed
4. marked by an uncommon quality; especially superlative or extreme of its kind
   同義詞：uncommon
5. having low density
   同義詞：rarefied, rarified
6. (of meat) cooked a short time; still red inside

1. It is rare to find such a genius nowadays.
   這樣的天才現(xiàn)在很少見。
2. A collector of rare insects will show us some of his latest discoveries.
   一位稀有昆蟲采集家將給我們看一些他的最新發(fā)現(xiàn)。
3. Parliament has passed an Act forbidding the killing of rare animals.
   國會通過了一項(xiàng)法令，禁止捕殺珍稀動(dòng)物。
4. These rare tigers are protected by special laws.
   這些珍貴的老虎受到專門法律的保護(hù)。
5. Those rare books are shelved in the East Library.
   那些珍貴的書籍都放在圖書館東館的架子上。
6. It's very rare for him to be so late.
   他很少遲到。
7. He's devoted his whole life to the protection of the rare animals.
   他終生獻(xiàn)身于珍稀動(dòng)物的保護(hù)。

rare

adj.（形容詞）
rar.er,rar.est 縮寫 r.
Infrequently occurring; uncommon:
罕見的：很少發(fā)生的；特殊的：
例句：
a rare event; a plant that is rare in this region.
罕見的事件；在本地區(qū)很少見的植物

Excellent; extraordinary:
優(yōu)秀的，不尋常的：
例句：
a rare sense of honor; a rare friend.
不尋常的榮譽(yù)感；極好的朋友

Thin in density: rarefied:
稀薄的：密度小的；經(jīng)過稀化的：
例句：
rare air.
稀薄的空氣

來源：
Middle English
中古英語
from Old French
源自 古法語
from Latin r3rus
源自 拉丁語 r3rus

【引伸】
rare.ness
n.（名詞）

---------------另--------------
rare
rare 2

adj.（形容詞）
rar.er,rar.est
Cooked a short time to retain juice and redness:
嫩的：煎的時(shí)間短，保留了汁和鮮紅色的：
例句：
a rare steak.
鮮嫩的牛排

來源：
Middle English rere [lightly boiled]
中古英語 rere [輕微的煎烤過的]
from Old English hrôr * see ker…-
源自 古英語 hrôr *參見 ker…-

【引伸】
rare.ness
n.（名詞）