1. 预兆：adumbrate 画轮廓 | adumbration 预兆 | adumbrative 暗示的
2. 草图：adulteration 掺杂;伪造;劣货 | adumbration 草图 | adustion 可燃性
3. 轮廓：Adumbral 遮阳的 | adumbration 轮廓 | adumbration 草图
4. 速描：adumbration 草图 | adumbration 速描 | advance 提前
noun
1. a sketchy or imperfect or faint representation
2. the act of providing vague advance indications
representing beforehand
Synonym: prefiguration foreshadowing