New Words：

zoology [zu'ɔlədʒi] n. 动物学
zoologist [zu'ɔlədʒist] n. 动物学家

Sample Sentences：

His father is an expert in zoology.
Botany is the study of plant life, and zoology is the study of animal life.

The zoologist has lived in the forest for ten years.
The zoologist had spent a long time living with monkeys.

New Words：

botany ['bɔtəni] n. 植物学
botanist ['bɔtənist] n. 植物学家

Sample Sentences：

He studied botany at university.
People who study plants are called botanists.
In learning botany, I understand much about nature.
Zoology and botany are the two main branches of biology.

zoology [zu'ɔlədʒi] n. 动物学

New Words：

rare [rer] adj. 稀少的；稀罕的；珍贵的
rarer ['reərə] 形容词rare的比较级形式

Sample Sentences：

These rare tigers are protected by special laws.
The higher you climb up the mountain, the rarer the air is.
He's devoted his whole life to the protection of the rare animals.

New Words：

orchid ['ɔ:kid] n. 兰花
bulldozer ['bul.dəuzər] n. 推土机

Sample Sentences：

Can you operate a bulldozer?
Many kinds of wild orchid are becoming rare.
The wallpaper in our bedroom has a pattern of orchids.

rare[rer] adj. 稀少的；稀罕的；珍贵的

New Words：

some time 一些时间，一段时间
sometime 某个时候

some times 几次
sometimes 有时

Sample Sentences：

I need some time to relax.
I'll call you sometime tomorrow.
I have been to Japan some times.
We sometimes have dinner with our friends on the weekend.