propylene + 单数动词(不可数用法,不加冠词)
指丙烯这种物质时,通常作不可数名词,前面不加冠词,谓语用单数。
Propylene is a colorless gas at room temperature.
丙烯在常温下是一种无色气体。
丙烯
有机化合物丙烯。一种无色气态(常温常压下)烯烃烃类,化学式为 C3H6。；丙二醇；[化] 丙烯
the organic compound propene; a colorless gaseous alkene with the chemical formula C3H6
有机化合物丙烯。一种无色气态(常温常压下)烯烃烃类,化学式为 C3H6。
The organic chemical compound propene. An alkene which is a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C3H6.
The factory produces propylene for use in making plastics.
这家工厂生产用于制造塑料的丙烯。
用法提示：propylene 是名词，在句中作宾语，指化学物质丙烯。
Propylene is a flammable gas at room temperature.
丙烯在室温下是一种易燃气体。
用法提示：propylene 作主语，为名词，表示该化合物。
Scientists study the reactions of propylene with other chemicals.
科学家研究丙烯与其他化学品的反应。
用法提示：propylene 作介词 of 的宾语，名词用法，指明研究对象。
指丙烯这种物质时,通常作不可数名词,前面不加冠词,谓语用单数。
Propylene is a colorless gas at room temperature.
丙烯在常温下是一种无色气体。
说明由丙烯加工、制得某物时,常与 from 连用。
Polypropylene is made from propylene.
聚丙烯是由丙烯制成的。
丙烯可直接放在另一名词前作定语,构成 propylene glycol(丙二醇)这类名称。
Propylene glycol is used in many cosmetics.
丙二醇被用于许多化妆品中。
grammar · medium
易错句子We need a propylene for the experiment.
正确表达We need propylene for the experiment.
这里泛指丙烯这种物质,propylene 用作不可数名词,前面不能加不定冠词 a;需要表示数量时应说 some propylene 或 a bottle of propylene。
grammar · medium
易错句子Polypropylene is a colorless gas at room temperature.
正确表达Propylene is a colorless gas at room temperature.
propylene 是常温常压下呈气态的丙烯单体(C3H6),polypropylene 是它聚合成的固态塑料(聚丙烯);两者词形相近但不能混用,描述这种无色气体必须用 propylene。
poly- + propylene
propylene + glycol
propylene + oxide
propylene + carbonate
prop- + -yl
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