自动回收，快捷方便，体积小重量轻，防止墨汁挥发；
结构设计，耐用，墨线上墨均匀，墨线鲜明，防止墨线鲜明逆转结构设计。
The automatic recovery, fast and convenient, small volume and light weight,
prevent ink;The structure design, durable, uniform ink ink, ink is bright,
bright line to prevent reversal of structure design.
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