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