dìng shū zhēn
variant of 訂書針|订书针[ding4 shu1 zhen1]
钉
dìng
to join things together by fixing them in place at one or more points
书
shū
abbr. for 書經|书经[Shu1 jing1]
针
zhēn
variant of 針|针[zhen1], needle
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