adj.感觉不到的；细微的
The pulse is almost imperceptible. 脉搏几乎摸不清。
He gave an almost imperceptible nod. 他略一点头,别人几乎无法察觉。
The difference between the two colors is imperceptible. 这两种颜色之间的差别很区难别。
There is an imperceptible change in temperature. 温度有细微的变化。
