| 单词 | 在需要时 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔Johnny-on-the-spot〕A person who is available and ready to act when needed.可随时应召出力的人：在需要时可随时应召并愿意出力的人美国传统〔assurance〕He gave an assurance of help when needed.他承诺在需要时提供帮助。外研社新世纪〔cut〕The safety device cuts in automatically.安全装置在需要时会自动开启。朗文当代〔dissemble〕Henry was not slow to dissemble when it served his purposes.在需要时，亨利会毫不迟疑地伪装自己。柯林斯高阶〔get ready〕Doctors are ready and waiting to give help when it's needed.医生们时刻待命，在需要时给予帮助。韦氏高阶〔on demand〕The heat-controlled implant delivers insulin on demand.受温度控制的埋置在需要时释放胰岛素。剑桥高阶〔slack〕We left some slack in the budget so that we can hire more people if we have to.我们在预算中留了一些款项，以便在需要时能雇用更多人手。韦氏高阶〔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美国传统〔support system〕A network of personal or professional contacts available to a person or an organization for practical or moral support when needed.支持系统：个人或组织在需要时，可用来作为实际或道义上支持的私人性或职业性的联系网络美国传统〔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美国传统〔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美国传统We don't own a car, but we rent one as and when we need it.我们没有汽车，但在需要时就租一辆。剑桥国际 |
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