| 单词 | secret ink |
| 释义 | secret inknoun : a fluid for invisible writing to be made visible afterwards: such as a : a colorless plant juice that can be made visible by subjecting to heat b : one of a pair of water solutions of chemicals that are colorless or nearly so and that when combined form a strongly colored compound c : a water solution of a fluorescent substance that is colorless in visible light but leaves characters on paper that fluoresce when exposed to ultraviolet light |
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