词汇讲解:
1. increase vt. 增大;增加;增强
例句:Travel increases one's knowledge of the world.
旅游增进人对世界的了解。
2. threat n. 威胁,恐吓
例句:Some people think that machinery is a threat to their jobs.
一些人认为机器是对他们工作的一种威胁。
3. include vt. 包括,包含
例句:The price includes both house and furniture.
价钱包括房子和家具。
4. economy n. 节约,节省
例句:The employees of the firm practised economy in doing everything.
该公司的雇员做任何事都厉行节约。
5. estate n. 地产
例句:He is a real estate agent.
他是一个房地产经纪人。
6. remain vi. 剩下,余留
例句:A few pears remain on the trees.
树上尚留有几颗梨子。