The blue ballpoint pen is mine.

蓝色的圆珠笔是我的。

youdao

Study on natural ageing of blue ballpoint pen inks by ultraviolet-visual spectrophotometry;

建立了一种基于非水毛细管电泳法区分蓝色圆珠笔油墨的方法。

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Wang2mu is an illustrator from Guangzhou, China, and he favors using the red and blue ballpoint pen to create his work.

王二木是一位来自中国广州的插画师，他热衷于使用红蓝两色的圆珠笔来创作插画作品。

youdao

The letters must be handwritten in Portuguese using blue or black ink ballpoint pen, with up to 800 words in letter format.

UNESCO: OFFICE IN BRASILIA