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writing ink 墨水。

writing machine

Dada supervision i write ink in half an hour . than play games 爸爸看我寫了半個點時的鋼筆字。就可以上網玩了。

Standard guide for test methods for forensic writing ink comparison 法醫書寫用墨水比對試驗方法的標準指南

Standard guide for writing ink identification 書寫墨水識別的標準指南