perceptible
adjective uk/pəˈsep.tə.bəl/ us/pɚˈsep.tə.bəl/
可察觉到的;可感知的
that can be seen, heard, or noticed
There was a barely perceptible movement in his right arm. 他的右胳膊微微动了一下。
The past year has seen a perceptible improvement in working standards. 去年，工作条件有了明显改善。