a smudge of dirt
collocation一块污渍
There was a smudge of dirt on his cheek.
他脸颊上有一块污渍。
驱虫的熏烟；浓烟（用于熏蒸）；污点或污迹,尤指黑色或烟灰状的。；驱虫的烟熏火；浓烟,如用于熏蒸的烟。
A dirty mark or smear, especially a dark one.
污点或污迹,尤指黑色或烟灰状的。
A blemish or smear, especially a dark or sooty one.
驱虫的烟熏火
a smoky fire to drive away insects
浓烟,如用于熏蒸的烟。
Dense smoke, such as that used for fumigation.
污垢造成的污渍
a blemish made by dirt
There is a smudge of ink on your shirt.
你衬衫上有一块墨水污迹。
用法提示：句中“smudge”为名词，表示“污迹”，具体指衬衫上的一块墨水痕迹。
AI contextual example
She tried to clean the smudges off the window, but they wouldn't come off.
她试图擦掉窗户上的污迹，但擦不掉。
用法提示：“smudges”是“smudge”的复数形式，作“污迹”讲，是“clean”的宾语。
AI contextual example
His glasses were covered in smudges, so he couldn't see clearly.
他的眼镜上布满了污迹，所以他看不清楚。
用法提示：“smudges”为复数名词，指眼镜上的污点，作“covered in”的宾语。
AI contextual example
stain 强调渗入表面、不易清除的深色污渍；smudge 常指灰迹或擦痕，较浅。
smear 强调被涂抹开的污痕，常带油性或湿性；smudge 更偏向灰或粉状痕迹。
blot 多指墨水或液体造成的一团污斑，常呈圆形；smudge 不一定是液体痕迹。
mark 含义广泛，作污点时很不具体；若要明确指灰迹或擦痕，用 smudge 更准确。
blemish 强调外观上的瑕疵，常用于皮肤或表面；smudge 只是污迹，不隐含损伤。
针对 smudge 的“污迹/污点”义项；spotlessness 强调完全没有污渍，与污迹相对。该反义词不适用于 smudge 的“驱虫熏烟”或“浓烟”义项。
针对 smudge 的“污迹/污点”义项；cleanliness 指清洁的状态，与污垢造成的污迹相对。同样不适用于其他两个义项。
一块污渍
There was a smudge of dirt on his cheek.
他脸颊上有一块污渍。
玻璃上的污迹
She wiped a smudge on the glass with her sleeve.
她用袖子擦掉了玻璃上的污迹。
留下污迹
Be careful not to leave a smudge on the painting.
小心别在画上留下污迹。
擦去污迹
He tried to wipe away the smudge on the page.
他试图擦掉书页上的污迹。
一块烟灰污迹
A smudge of soot marked the wall above the stove.
炉子上方的墙上有一块烟灰污迹。
一块深色污迹
I saw a dark smudge on the horizon.
我看到地平线上有一块深色污迹。
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Dictionary facts from ECDICT, WIKTIONARY.