tobacco (uncountable)
作物质名词时不可数，前面不加 a/an，也不用复数，谓语动词用单数。
Tobacco is a major cause of lung cancer.
烟草是导致肺癌的主要原因之一。
烟草；烟叶
tobaccoes — plural of tobacco
烟草（植物）；烟草属植物；烟草品种；任何烟草属植物。；烟草植物的叶子,经过干燥和准备后用于吸烟或摄入；烟草的叶片及其他一些栽培收获用于制作香烟、雪茄、鼻烟、烟斗烟或咀嚼的品种。
The dried and prepared leaves of the tobacco plant, used for smoking, chewing, or as snuff.
任何烟草属植物。
Any plant of the genus Nicotiana.
烟草植物的叶子,经过干燥和准备后用于吸烟或摄入
leaves of the tobacco plant dried and prepared for smoking or ingestion
烟草的叶片及其他一些栽培收获用于制作香烟、雪茄、鼻烟、烟斗烟或咀嚼的品种。
Leaves of Nicotiana tabacum and some other species cultivated and harvested to make cigarettes, cigars, snuff, for smoking in pipes or for chewing.
芳香的一年生或多年生草本植物和灌木
aromatic annual or perennial herbs and shrubs
一种烟草。
A variety of tobacco.
The smell of tobacco drifted from the back porch.
烟草的气味从后门廊飘来。
用法提示：tobacco 是名词，这里指烟草/烟叶，作不可数名词使用。
She bought a packet of tobacco for her father.
她为父亲买了一包烟草。
用法提示：tobacco 是名词，指供消费者使用的烟草制品，此处为不可数用法。
These tobaccos grow best in warm, rainy climates.
这些烟草品种在温暖多雨的气候中生长得最好。
用法提示：tobaccos 是 tobacco 的复数形式，名词，指不同品种的烟草。
作物质名词时不可数，前面不加 a/an，也不用复数，谓语动词用单数。
Tobacco is a major cause of lung cancer.
烟草是导致肺癌的主要原因之一。
名词作定语修饰另一个名词时用单数 tobacco，如 tobacco smoke、tobacco company。
The tobacco industry spends millions on advertising.
烟草行业在广告上花费数百万。
指不同品种或种类时可作可数名词，复数用 tobaccos，也可写作 tobaccoes。
The shop sells fine tobaccos from Cuba.
这家店出售来自古巴的优质烟叶。
grammar · medium
易错句子He bought a tobacco on his way home.
正确表达He bought some tobacco on his way home.
表示“烟草、烟叶”这一物质材料时，tobacco 是不可数名词，不能加不定冠词 a/an，也不能用复数；要说“一些”用 some，要计量则用量词结构，如 a packet of tobacco。
grammar · medium
易错句子My uncle smokes twenty tobaccos a day.
正确表达My uncle smokes twenty cigarettes a day.
tobacco 指烟叶、烟草（材料），不可数，不能按“根”计数；汉语的“烟”兼指“香烟”，而一支支可数的香烟在英语里是 cigarette，所以与 twenty 这类数字搭配的应是 cigarette。
烟草业
The tobacco industry is heavily regulated in many countries.
许多国家对烟草业实行严格监管。
烟草公司
He invested a large sum in a tobacco company.
他在一家烟草公司投入了一大笔钱。
烟草烟雾
Secondhand tobacco smoke is harmful to children.
二手烟草烟雾对儿童有害。
烟叶
Farmers harvest the tobacco leaves in late summer.
农民在夏末采收烟叶。
烟草制品
The law bans advertising of tobacco products.
法律禁止为烟草制品做广告。
嚼烟
Chewing tobacco is banned in some workplaces.
一些工作场所禁止嚼烟。
Choose the next layer that will help you use tobaccoes with more confidence.
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