Ink can be pretty tough to get out, but most ballpoint pen ink stains come out with lots of persistence and patience.

墨迹很难清除，不过，只要有足够的恒心与耐心，大部分圆珠笔印迹都是可以清除的。

youdao

It was only blue ink (ballpoint pen) on slightly yellow paper.

这仅是用蓝色的原子笔画在淡黄色的纸上而已。

youdao

I changed the ink cartridges in my ballpoint pen.

我换了圆珠笔里的墨水芯。

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