1
bacterium + is
bacterium 是单数形式，谓语动词用单数。
This bacterium is resistant to antibiotics.
这种细菌对抗生素有抗药性。
细菌
先理解核心含义，再看它在真实句子里的用法。
细菌
A single-celled or noncellular microorganism without chlorophyll that reproduces by fission; important as pathogens and for biochemical properties.
This bacterium is resistant to antibiotics.
这种细菌对抗生素有抗药性。
医学术语也指无芽胞杆菌属
具有细胞壁但无细胞核或细胞器的单细胞生物
A single-celled organism with cell walls but no nucleus or organelles.
单细胞或无细胞结构的球形、螺旋形或杆状微生物,无叶绿素,分裂繁殖,是重要病原体,具生化特性,分类困难,常被视为植物
(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants
A single bacterium can multiply rapidly under favorable conditions.
一个细菌在适宜条件下可以迅速繁殖。
Certain bacteria are essential for the digestion of food in the human body.
某些细菌对人体消化食物至关重要。
The scientist observed the bacterium under a microscope.
科学家在显微镜下观察了这种细菌。
bacterium 是单数形式，谓语动词用单数。
This bacterium is resistant to antibiotics.
这种细菌对抗生素有抗药性。
使用 that 引导的定语从句修饰 bacterium。
A bacterium that causes disease can be harmful.
一种引起疾病的细菌可能是有害的。
复数形式 bacteria 更常用，谓语动词用复数。
Bacteria are found everywhere in the environment.
细菌在环境中无处不在。
Not this
This bacterium are harmful.
Use this
This bacterium is harmful.
bacterium 是单数名词，应用单数动词 is。
Not this
Bacteria is a microorganism.
Use this
Bacteria are microorganisms.
bacteria 是 bacterium 的复数形式，应用复数动词 are。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
有害细菌
Harmful bacteria can cause food poisoning.
有害细菌会导致食物中毒。
细菌繁殖
Bacteria multiply rapidly in warm conditions.
细菌在温暖条件下迅速繁殖。
抗药性细菌
Antibiotic-resistant bacteria are a serious health threat.
抗药性细菌对健康构成严重威胁。
单个细菌
A single bacterium can multiply into millions.
一个细菌可以繁殖成数百万。
细菌致病
Many bacteria cause diseases in humans.
许多细菌会导致人类疾病。
Use bacterium naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
词尾-um表示单数（如museum），bacterium就是单个细菌，复数bacteria去掉-um加-a。
该词通常用于正式或学术语境，多见于生物学、医学等专业领域，在口语中较少使用。
All words end in '-ium' but have different stressed vowels; none rhymes with 'bacterium'.
Dictionary facts from ECDICT, WIKTIONARY.