182.in demand有需求;on demand受到要求时
183. be dependent on 依靠
184. deprive sb. of sth. 剥夺某人某物
185. derive…from(=obtain…from)从…取得,由…来的。derive from(=come from)起源于
186. despair of (=lose all hope of) 绝望
187. in despair 绝望
188. despite (=in spite of) 不管, 尽管
189. in detail 详细地
190. deviate from 偏离, 不按…办191. on a diet 吃某种特殊饮食, 节食