4. introduce v. 介绍；引进 introduce sb. to sb. ; introduce a new system

introduction n. 介绍

5. develop v. 发展；开发；冲洗；培养 　

6. donate v. 捐赠 donate sth. to …

donation n. 捐赠 make donations to…

7. please v. 使…感到满意

pleasant adj. 令人满意的；pleased adj. 满意的

pleasure n. 满意；快乐

development n. 发展 developing 发展中的；developed 发达的