比較一下:
http://www.amazon.com/exec/obidos/tg/detail/-/B00005QJ2J/qid=1080186699/sr=8-6/ref=sr_8_xs_ap_i6_xgl147/104-3579854-4955900?v=glance&s=pc&n=507846
http://www.amazon.com/exec/obidos/tg/detail/-/B00005QJ2J/qid=1080186699/sr=8-6/ref=sr_8_xs_ap_i6_xgl147/104-3579854-4955900?v=glance&s=pc&n=507846