a blackhead on sth
a blackhead 是可数名词单数，后接 on + 身体部位说明黑头的位置。
She has a blackhead on her nose.
她鼻子上长了一个黑头。
黑头；黑头粉刺
黑头病；组织滴虫病；潜鸭；一种粉刺,皮肤瑕疵,寻常痤疮的一种,毛孔被深色、坚硬、干酪样的角蛋白物质堵塞,在皮肤表面形成黑色硬头。；堵塞毛孔的黑色顶端栓塞；家禽组织滴虫病的一种,特征是禽类头部出现发绀变色。
A small black-tipped plug that clogs a pore of the skin; a type of comedo in acne.
一种粉刺,皮肤瑕疵,寻常痤疮的一种,毛孔被深色、坚硬、干酪样的角蛋白物质堵塞,在皮肤表面形成黑色硬头。
A type of comedo, a skin blemish, a type of acne vulgaris, where a pore becomes clogged with a dark, hard, cheesy keratin-filled substance forming a hard black "head" on the skin's surface.
堵塞毛孔的黑色顶端栓塞
a black-tipped plug clogging a pore of the skin
家禽组织滴虫病的一种,特征是禽类头部出现发绀变色。
A form of histomoniasis in poultry, characterized by cyanotic discoloration on the bird's head.
潜鸭属(Aythya)的各种鸭类。
A scaup: any of various ducks of the genus Aythya.
She used a pore strip to remove the blackheads on her nose.
她用鼻贴去除鼻子上的黑头粉刺。
用法提示：blackheads 作宾语，指皮肤毛孔中的黑头粉刺。
The dermatologist recommended a salicylic acid cleanser to treat my blackheads.
皮肤科医生推荐用水杨酸洁面乳治疗我的黑头粉刺。
用法提示：blackheads 作宾语，指需要治疗的皮肤问题。
I noticed a few blackheads on my chin this morning.
今天早上我注意到下巴上有几个黑头粉刺。
用法提示：blackheads 作宾语，描述观察到的皮肤状况。
a blackhead 是可数名词单数，后接 on + 身体部位说明黑头的位置。
She has a blackhead on her nose.
她鼻子上长了一个黑头。
blackheads 是复数形式，泛指多颗黑头；后接 on + 身体部位说明位置。
He often gets blackheads on his forehead.
他额头上经常长黑头。
have blackheads 表示“长有黑头”，强调状态而非动作。
Many teenagers have blackheads.
许多青少年长有黑头。
grammar · medium
易错句子I have many blackhead on my nose.
正确表达I have many blackheads on my nose.
blackhead 是可数名词，前面有 many 表示多个时，必须用复数形式 blackheads。汉语名词通常不通过词尾变化表示复数，所以容易漏掉 -s。
grammar · medium
易错句子I have blackhead on my nose.
正确表达I have a blackhead on my nose.
blackhead 是可数名词，单数形式在英语中通常要加冠词 a/an。这里指一颗黑头，所以用 a blackhead；汉语没有冠词，容易直接省略。
whitehead 是闭合性粉刺，毛孔被角质封住、顶端呈白色；blackhead 是开放性粉刺，毛孔口敞开，顶端油脂被氧化后发黑，两者是同类皮损的两端。
pimple 泛指红肿、常带炎症的痘子，可有脓头；blackhead 特指毛孔口被角质和油脂堵塞、顶端发黑但通常不发炎的开放性粉刺，不能说“a blackhead hurts”。
zit 是随便的口语说法，泛指脸上任何痘痘，多用于非正式场合；blackhead 是中性、具体的皮肤学术语，指特定类型的黑头粉刺，不能用来泛指。
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