隐显墨水

是一种类似于橡皮的工具，它可以使隐形墨水显形。

invisible

invisible

groping in the air and pulling invisible strings

invisible income; off-payroll income; side money

invisible worm sore of the nose

invisible assets

invisible assets【会计】;off-the-book property【会计】;unlisted assets【会计】

invisible income; off-payroll income;side money