thanks, good answer! I also ask a friend, his answer

来源: 于 2009-05-08 07:23:40 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

is:

anode attracts anion （阳极吸引阴离子） an-

cathode attracts cation （阴极吸引阳离子） ca-