您要查找的是不是：
- Water contains hydrogen and oxygen. 水含有氢和氧。
- It was in the days when motorcars were rare. 那是在汽车还罕见的时代。
- A top hat is a rare sight these days. 高顶大礼帽现在已不多见。
- I must admit I am very fond of collect rare book. 我得承认我很喜欢海内珍本。
- Oxygen enters into many compound bodies. 氧是许多化合物的组成部分。
- It's very rare for him to be so late. 他很少迟到。
- Red squirrels are now very rare in Britain. 红色的松鼠在英国已十分罕见了。
- The white-lipped deer are rare in this area. 白唇鹿在这个地区很罕见。
- Mars is too dry and poor in oxygen. 火星上面过于干燥，并且缺乏氧气。
- These rare tigers are protected by special laws. 这些珍贵的老虎受到专门法律的保护。
- Water is composed of hydrogen and oxygen. 水由氢和氧组成。
- This rare bird has become an endangered species. 这种珍禽已成为濒临灭绝的物种。
- A rare smile lit up his stern features. 他那难得一见的微笑在他死板的脸上平添一些生气。
- Fish take in oxygen through their gills. 鱼通过鳃摄取氧气。
- It is rare to find such a genius nowadays. 这样的天才现在很少见。
- He is which is rare for him, in a bad temper. 他在发脾气，这对他来说是很少见的。
- Many kinds of wild orchid are becoming rare. 很多种野生兰越来越罕见了。
- The oxygen react vigorously with the impurity in the iron. 氧气与铁中的杂质发生剧烈的化学反应。
- The oxygen workshop caught fire and set off a chain of explosions. 氧气车间着了火，引起了一连串的爆炸。
- These flowers are very rare in this country. 这些花在该国很少见。
