ink penetration

例句：

1. 1. The ink penetrationof the paper is very strong.
   纸张的墨水渗透力很强。
2. 2. The ink penetration of the paper is very fast.
   纸张的墨水渗透速度很快。
3. 3. The ink penetration of the paper isvery slow.
   纸张的墨水渗透速度很慢。