If you've ever wondered how a roller ball pen writes, you're not alone. Most of us have used a roller ball pen at some point. It has the same mechanism as a fountain pen, but instead of using a liquid ink, these pens use a gelled or oil-based viscous ink. That makes roller ball pens unique among fou...

A marker pen is also called a marker pen, a microphone pen. Permanently attached, non-decolorized, with standard 12 colors, can be written on any paper, plastic, glass, whiteboard, metal and other solids, the ink is oily, non-toxic, can be wiped off with organic solvents such as alcohol, and Similar...

We often organize and encourage employees to do some activities, such as mountaineering, fishing, cycling, etc., to strengthen the communication between colleagues, and also to combine work with rest.

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