| 单词 | 经常更换 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔cartridge〕Change the filter cartridge as often as instructed by the manufacturer.按照生产厂家的使用说明，经常更换过滤筒。柯林斯高阶〔downside〕The downside of the camera is that the batteries have to be replaced often.这款相机的缺点是需要经常更换电池。韦氏高阶 |
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