单词 | 隐显墨水 |
例句 | DEFINITIVE EXAMPLES 权威例句It looked like a blank sheet of paper but there was a message on it in invisible ink (=ink which can not be seen until it is treated with chemicals or heat).这看起来像一张白纸,但上面有用隐显墨水书写的一封信。剑桥国际 |
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