stem

n.（花草的）茎；词干；（高脚酒杯的）脚；烟斗柄

vt.遏制[阻止]（液体的流动等）；阻止；封堵；遏止

noun

1. （花草的）茎；（花或叶的）梗，柄
   the main long thin part of a plant above the ground from which the leaves or flowers grow; a smaller part that grows from this and supports flowers or leaves
2. （高脚酒杯的）脚
   the long thin part of a wine glass between the bowl and the base
3. 烟斗柄
   the thin tube of a tobacco pipe
4. 有…茎（或梗）的
   having one or more stems of the type mentioned
   1. a long-stemmed rose
      一枝长茎玫瑰
5. 词干
   the main part of a word that stays the same when endings are added to it
   1. ‘Writ’ is the stem of the forms ‘writes’, ‘writing’ and ‘written’.
      writ是writes、writing和written三个词的词干。

verb

1. 阻止；封堵；遏止
   to stop sth that is flowing from spreading or increasing
   1. The cut was bandaged to stem the bleeding.
      伤口进行了包扎止血。
   2. They discussed ways of stemming the flow of smuggled drugs.
      他们讨论了遏制走私毒品流通的办法。
   3. The government had failed to stem the tide of factory closures.
      政府没有控制住工厂纷纷倒闭的势头。

名词复数形式:stems 过去式:stemmed 现在分词:stemming 第三人称单数:stems 过去分词:stemmed

stem 茎，柄，梗，词干

来自古英语 stemn,植物茎，树干，来自 Proto-Germanic*stamniz,站立，来自 PIE*sta,站立，词 源同 stand,state.引申诸相关词义。

1. He told the magazine in an exclusive interview: 'All my problems stem from drink'.
   他在接受一家杂志社的独家采访时说：“我所有的问题都是饮酒造成的。”
2. The main stem will extend to around 12ft, if left to develop naturally
   如果任其自然生长，主干可以长到约12英尺。
3. The administration is trying to stem the flood of refugees out of Haiti and into Florida
   政府当局正试图阻止大批难民逃离海地，进入佛罗里达。
4. He said the move would definitely stem the haemorrhage of talent and enterprise from the colony.
   他表示这一举措势必会抑制殖民地人才和企业严重流失的现象。
5. The stinging nettle has a square stem and little hairs.
   荨麻长有四方茎和细小茸毛。
6. Cut them off cleanly through the stem just below the node.
   就从茎节下面，沿茎干把它们全砍掉。
7. He pointed at me with the stem of his pipe
   他用烟斗柄指着我。
8. Sedge is similar in appearance to grass but has a solid rather than a hollow stem
   莎草看上去和普通的草没什么两样，但其草茎是实芯的而不是空芯的。
9. Make a slit in the stem about half an inch long.
   在树干上切一道大约半英寸长的口子。
10. All my problems stem from drink
    我所有的问题都源于酗酒。
11. Much of the instability stems from the economic effects of the war.
    不稳定局面多半是由战争对经济的影响造成的。
12. Austria has sent three army battalions to its border with Hungary to stem the flow of illegal immigrants
    奥地利已派出3个营的兵力去本国和匈牙利交界的边境地区阻止非法移民的流入。
13. The authorities seem powerless to stem the rising tide of violence
    当局似乎无力阻止愈演愈烈的暴力活动。
14. He was still conscious, trying to stem the bleeding with his right hand.
    他依然清醒，正试图用右手止血。
15. He stooped down, cut the stem for her with his knife and handed her the flower.
    他弯下腰，用刀替她将花茎割断，然后将花递给她。
16. A South African television report said the ship was ablaze from stem to stern.
    南非一则电视新闻报道称，那艘船从头到尾都着了火。
17. Twist the string carefully around the second stem with the other hand
    用另外一只手小心地把细绳缠绕到第二根茎上。
18. Correct judgements stem from thorough investigation and study.
    正确的判断来源于周密的调查研究。
19. The fleet from stem to stern covered a thousand li,| its pennons and banners filled the sky.
    舳舻千里，旌旗蔽空。（苏轼《前赤壁赋》）
20. Wild rice stem belongs to herb of marsh of gramineous vivacious perennial root.
    茭白属于禾本科多年生宿根沼泽草本植物。
21. The stem of the bird feather is usually hollow.
    鸟羽毛的羽轴一般是中空的。
22. In addition to accumulating and preserving these oncogenic scars, a stem cell's enormous proliferative capacity makes it an ideal target for malignancy.
    干细胞除了可累积并保存这些致癌突变外，还具有强大的增殖能力，使它成为癌化的理想目标。
23. He developed embryonic stem cells that could produce mice that carried new genetic material.
    他发展了胚胎干细胞，此类细胞能够产生携带新遗传物质的小鼠。
24. Objective To establish an efficient method for isolation and culture of mesenchymal stem cells from mouse bone marrow.
    目的建立一种从小鼠骨髓中分离培养间充质干细胞的高效方法。
25. The scientists said they developed stem cell lines from two of these cells.
    科学家们称他们从这些细胞中的两个细胞中发展了干细胞序列。
26. Mesenchymal stem cells can differentiate into bone, fat, cartilage and other types of cells.
    间充质干细胞能分化成骨、脂肪、软骨和其他种类细胞。
27. We will need to finance research in technology innovation and biotechnology, including stem cell research.
    我们需要为技术创新和生物技术提供研究资金，其中包括干细胞研究。
28. I sowed countless seeds but I just got three stem lettuce out.
    我已经播种了无数的种子，但是我只得到了三个莴笋。
29. And stem cell and nanotechnology research offer real possibilities for the reanimation of tissue.
    细胞和纳米技术的研究已经可以提供复活这些组织的可能性。