zì dòng qiān bǐ
mechanical pencil
propelling pencil
自
zì
(bound form) self; oneself
动
dòng
(of sth) to move
铅
qiān
old variant of 鉛|铅[qian1]
笔
bǐ
writing brush; writing implement (pen, pencil etc) (CL:支[zhi1],枝[zhi1])
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