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筆ペン: brush pen (ink pen that that mimics the feel of a traditional brush)
My new fountain pen is easy to write with.
Clipping of シャープペンシル (shāpu penshiru, “mechanical pencil”).
I lost my mechanical pencil, so I'm going to buy a new one.
Short for ペンタブレット (pen taburetto).
My new pen tablet is very easy to use.
(organic chemistry) pentyne
I used pentyne in an organic chemistry experiment.
quill (pen)
He was writing a letter with an old-fashioned quill pen.
chemical
This reaction occurs through a chemical process.
a chemist
He is an excellent chemist who made many discoveries.
petrochemistry
He is an expert in petrochemistry.
chemical equation
It's difficult to decipher this chemical equation.
Understanding chemical equations is difficult.
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