effaceable
/ɪ'feɪsəbl/capable of being effaced; "the fire's worst scars were effaceable by a comprehensive program of reforestation"
adjective [原级] 能擦掉的;可抹去的;会被忘却的
The writing on the whiteboard is effaceable with a simple wipe. 白板上的字迹用简单的擦拭就可以擦掉。