191. on a diet 吃某种特殊饮食, 节食

190. deviate from 偏离, 不按…办

189. in detail 详细地

188. despite (=in spite of) 不管, 尽管

187. in despair 绝望

186. despair of (=lose all hope of) 绝望

185. derive…from(=obtain…from)从…取得,由…来的.derive from(=come from)起源于

184. deprive sb. of sth. 剥夺某人某物

183. be dependent on 依靠

182.in demand有需求;on demand受到要求时