单词学习：self-vanishing 形容词/复合词
self-vanishing
/ˌself ˈvænɪʃɪŋ/
自我消失的，指能够自行消失或消退的特性。
The self-vanishing ink on the document ensured that the secret message could only be read by 顾老师 before it faded away completely.
文件上的自消墨水确保了秘密信息只有在完全消失前才能被顾老师阅读。
单词卡片
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