inking up

例句：

1. 1. The ink on the paper has started to ink up.
   纸上的墨水开始变浓了。
2. 2. The paint on the wall is starting to ink up.
   墙上的油漆开始变黑了。
3. 3. The pen ink has inked up the page.
   钢笔里的墨水已经把页面变稠了。