Weiss's stain

例句：

1. 1. The stain on the shirt is quite noticeable.
   衬衫上的污渍相当明显。
2. 2.The mark on the wall was clearly made by a child.
   墙上的印记显然是孩子留下的。
3. 3.He left an imprint of his hand on the paper.
   他的手印留在了纸上。