| 单词 | 需要时 |
| 释义 | 〔coupon〕One of a set of detachable certificates that may be torn off and redeemed as needed:联票，票券：一系列可分开的证书之一，可以在需要时撕下和赎回：〔resource〕Often resources An available supply that can be drawn on when needed. 常作 resources 资源：需要时可供提取使用的供应〔allow〕To plan for in case of need:酌留，预做准备：万一需要时而做计划：〔supply〕Often supplies Materials or provisions stored and dispensed when needed. 常作 supplies 贮备：贮存起来并在需要时进行分发的物资或储备物〔understudy〕To study or know (a role) so as to be able to replace the regular performer when required.学习（某角色）以便当替角；练习当替角：学习或了解（一个角色）以便能在需要时代替正式的演员〔forthcoming〕Available when required or as promised:现成的，随要随到的：需要时能得到的或承诺可以得到的：〔revoke〕To fail to follow suit in cards when required and able to do so.藏牌：需要时不跟同一套花色的牌，且能这样做时〔ace〕A hidden advantage or resource kept in reserve until needed.锦囊妙计：隐藏的优势或资源，一直保存到需要时〔fall〕fall back on old friends in time of need.在需要时求助于老朋友们〔understudy〕To be engaged in studying a role so as to be able to replace the regular performer when required.当替角，当替工：参加学习一个角色，以便能在需要时代替正规的表演 |
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