182.in demand有需求;on demand受到要求時
183. be dependent on 依靠
184. deprive sb. of sth. 剝奪某人某物
185. derive…from(=obtain…from)從…取得,由…來的.derive from(=come from)起源于
186. despair of (=lose all hope of) 絕望
187. in despair 絕望
188. despite (=in spite of) 不管, 盡管
189. in detail 詳細地
190. deviate from 偏離, 不按…辦