单词	stem
释义	noun | verb stemstem1 /stɛm/ ●●○ noun [countable] Etymology ETYMOLOGYstem1 Origin: Old English stefn, stemn 1 science, biology a long thin part of a plant, from which leaves, flowers, or fruit grow:  roses with long stems2the long thin part of a wine glass, vase, etc., between the base and the wide top3the narrow tube of a pipe used to smoke tobacco4eng. lang. arts the part of a word that stays the same when different endings are added to it, for example “driv-” in “driving” and “driven”5from stem to stern all the way from the front to the back, especially of a ship [Origin: Old English stefn, stemn] → see also brain stem noun | verb stemstem2 verb (stemmed, stemming) [transitive] Etymology ETYMOLOGYstem2 Origin: 1200-1300 Old Norse stemma. stem from 1900-2000 From ➔ STEM1 Verb Table VERB TABLE stem Simple Form Present I, you, we, they stem he, she, it stems Past I, you, he, she, it, we, they stemmed Present perfect I, you, we, they have stemmed he, she, it has stemmed Past perfect I, you, he, she, it, we, they had stemmed Future I, you, he, she, it, we, they will stem Future perfect I, you, he, she, it, we, they will have stemmed Continuous Form Present I am stemming he, she, it is stemming you, we, they are stemming Past I, he, she, it was stemming you, we, they were stemming Present perfect I, you, we, they have been stemming he, she, it has been stemming Past perfect I, you, he, she, it, we, they had been stemming Future I, you, he, she, it, we, they will be stemming Future perfect I, you, he, she, it, we, they will have been stemming 1stem the tide/flow/growth etc. of something to stop something from spreading or developing:  The government is trying to stem the flow of drugs into the country.2formal to stop the flow of a liquid:  He used a rag to stem the bleeding.stem from something phrasal verb to develop as a result of something else:  A lot of her emotional problems stem from her childhood.
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