0 to leave a mark on something that is difficult to remove -- 沾汙，染汙；留下汙跡
She stripped the floorboards and stained them dark brown. 她刮掉原來的漆，把地板刷成了深棕色。
This carpet is ideal for the kitchen because it doesn't stain easily. 這塊地毯很適合在廚房裡用，因爲它不怕髒。
While she was changing the wheel on her car, her coat had become stained with oil. 她幫汽車換輪胎時，外套沾上了油污。
Tomato sauce stains terribly - it's really difficult to get it out of clothes. 蕃茄醬一沾上就很麻煩——很難把它從衣服上洗掉。
1 to permanently spoil something such as someone's reputation -- 敗壞，玷污（名聲等）
2 a dirty mark on something that is difficult to remove -- 汙漬；汙點
3 permanent damage to someone's reputation or character -- 汙點
Between 30 and 60 min we frequently observed parasites having surface patches on the schistosomulum body but with little or no staining on the anterior.
Distribution and morphology of human cone photoreceptors stained with anti-blue opsin.
There is no difference in staining pattern in regard to the subtypes of the rhabdomyosarcomas, namely embryonal or alveolar subtypes.
Sections (6 m) were cut from both faces of bisected tissues and stained with hematoxylin and eosin.
Serial sagittal sections passing through the optic nerve were collected, stained with hematoxylin and eosin, and analyzed for pathologic changes.
Nerves estimated to contain greater than 25 dark staining axons per section but still maintaining a significant portion of live axons were rated as moderate.
The sections were stained with antibodies for those two antigens.
We found minor differences in the staining pattern between methanol and paraformaldehyde fixed cells, but immuno-labeled nuclear structures were visible regardless of fixation.
