重点讲解:
1. be made out of (由…)构成的;(由…)制成的;
例句:The shoes are made out of leather.
这些鞋子是用皮革制成的 。
2. for example 例如;比如;
例句:I like to keep a pet, for example, a dog or a cat.
我喜欢养宠物,如狗或猫 。
3. be composed of 组成;构成;
例句:Most of the natural world is composed of only about 20 elements.
自然界绝大多数物质大约只由20种元素组成 。
adj. 传统的