| 单词 | when needed |
| 例句 | 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〔WORK FOR SB〕At certain stages of a project, most staff members are expected to work additional hours when needed. 一个项目进展到某些阶段，如有需要大部分员工都得加班。朗文写作活用〔allowance〕The budget makes allowances for extra staff when needed.预算考虑到可能需要另外招聘员工。朗文当代〔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〔double〕She doubles on keyboards when needed but is mainly on vocals.必要时她会兼奏键盘乐器, 但主要还是以歌唱为主。外研社新世纪〔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美国传统〔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 |
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