It is pure and unstained by sin.

他纯洁，没有罪的污垢。

An apron keeps his clothing unstained.

围裙使他的衣服保持原样。

And thou present 'st a pure unstained prime.

而你的正是纯洁无瑕的初春。

One of washing cloth is unstained white fibre, the other is color fiber.

水洗的衣物一是未经染色的白色织物，另一种是可以进行水洗的有颜色织物。

The plasma cells and erythrocyte were unstained in the splenic red pulp.

红髓中的浆细胞和红细胞不染色。