"he had a smudge on his cheek"
"he made a huge blot on his copybook"
"The wine spotted the tablecloth"
It looked..like an ordinary ink blot.
Charabancs and monstrous hordes of hikers are blots upon the landscape.
Blot not thy innocence with guiltless blood.
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)