| 单词 | sac |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔bag〕An organic sac or pouch, such as the udder of a cow.（牛的）乳房：有机体器官的液囊或袋，如牛的乳房美国传统〔balloon〕Medicine A sac that is inserted into a body cavity or tube and distended with air or gas for therapeutic purposes, such as angioplasty.【医学】 充气囊：出于治疗目的而插入体腔或体管内的充满空气或其他气体的囊，如血管成形术美国传统〔bladder〕Anatomy Any of various distensible membranous sacs, such as the urinary bladder or the swim bladder, that serve as receptacles for fluid or gas.【解剖学】 膀胱，囊：一种可膨胀有膜囊状物，如膀胱或鳔，作为储存液体或气体的器官美国传统〔cyst〕Anatomy A sac or vesicle in the body.【解剖学】 囊，泡囊：身体中的囊或庖囊美国传统〔cyst〕Biology A small capsulelike sac that encloses certain organisms in their dormant or larval stage.【生物学】 包囊：在他们的休眠期或幼虫期内有某些器官的囊状小气囊美国传统〔cyst〕Pathology An abnormal membranous sac containing a gaseous, liquid, or semisolid substance.【病理学】 囊肿：一种含有气态、液态或者半固态物质的异常膜性囊美国传统〔diverticulum〕A pouch or sac branching out from a hollow organ or structure, such as the intestine.憩室，支囊，膨部：从肠之类的中空器官或结构上分支出来的袋或囊美国传统〔embryonic membrane〕Any of the membranous structures closely associated with or surrounding a developing vertebrate embryo, including the amnion, chorion, allantois, and yolk sac.胚膜：任何与发育中的胚胎相关或包围胚胎的膜状结构，包括衣胞、绒膜胚囊、尿膜和卵黄囊美国传统〔enucleate〕Medicine To remove (a tumor or an eye, for example) whole from an enveloping cover or sac.【医学】 剜出：从一个包裹性表面或袋中去除（例如肿瘤或眼球）美国传统〔mediastinum〕The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.纵隔：哺乳动物体内将胸腔分为左右两半的中隔，由心脏和除肺以外的胸腔脏器组成美国传统〔membranous labyrinth〕The fluid-filled membranous sacs of the inner ear that are associated with the senses of hearing and balance.膜迷路：内耳之充满液体的膜状结构，与听觉及平衡感觉有关美国传统〔nucellus〕The central portion of an ovule in which the embryo sac develops; the megasporangium.珠心：胚珠的中心，胚芽囊在此发育；大孢子囊美国传统〔oogonium〕A female reproductive structure in certain thallophytes, usually a rounded cell or sac containing one or more oospheres.雌性生殖结构：在某些同节植物中的雌性生殖组织，通常是一个圆形细胞或气囊，包含一个或多个卵球美国传统〔osmeterium〕An eversible glandular sac on the first thoracic segment of many caterpillars that secretes an unpleasant-smelling substance to ward off predators.丫腺：许多鳞翅目幼虫胸部第一节的可翻转腺囊，能散发难闻气味驱走捕食者美国传统〔ovule〕Botany A minute structure in seed plants, containing the embryo sac and surrounded by the nucellus, that develops into a seed after fertilization.【植物学】 胚珠：种子植物的一个小的结构，含有胚囊并被珠心所包围，施肥后长成种子美国传统〔pericardium〕The membranous sac filled with serous fluid that encloses the heart and the roots of the aorta and other large blood vessels.心包：囊状膜层，其间充满了包围着绕心脏、大血管的根部和其它大血管的浆状液体美国传统〔pneumatophore〕A gas-filled sac serving as a float in some colonial marine hydrozoans, such as the Portuguese man-of-war.气囊，浮囊：在某些群居的海生水螅纲动物中，用作漂浮物的一种充气小囊，如葡萄牙的僧帽水母的浮囊美国传统〔polar nucleus〕Either of two nuclei located centrally in a flowering plant embryo sac that eventually fuse to form the endosperm nucleus.极核：位于一株开花植物的胚囊中央的两个细胞核的任一个，这两个细胞核最终融合而形成内胚乳细胞核美国传统〔saccate〕Having a pouch or sac.有袋或囊的美国传统〔saccate〕Shaped like a pouch or sac.囊状或袋状的美国传统〔saccule〕A small sac.小囊美国传统〔saccule〕The smaller of two membranous sacs in the vestibule of the inner ear.球囊：内耳的膜的迷路的两个隔膜小室中较小的一个美国传统〔sac〕The lungs consist of millions of tiny air sacs.肺是由数百万个微小肺泡组成的。外研社新世纪〔sac〕The lungs consist of millions of tiny air sacs.肺由数百万个小气囊组成。柯林斯高阶〔scrotum〕The external sac of skin enclosing the testes in most mammals.阴囊：在大多数哺乳动物中包着睾丸的皮囊美国传统〔synergid〕One of two small cells lying near the egg in the mature embryo sac of a flowering plant.助细胞：位于开花植物成熟胚囊的卵细胞周围的两个小细胞之一美国传统〔theca〕A case, covering, or sheath, such as the pollen sac of an anther, the spore case of a moss, or the outer covering of the pupa of certain insects.壳，鞘：盖，表层或鞘，如花药的花粉囊，苔藓的孢子壳或菜昆虫的蛹外壳美国传统〔urinary bladder〕An elastic, muscular sac situated in the anterior part of the pelvic cavity in which urine collects before excretion.膀胱：位于盆腔前部的弹性的肌囊，尿液在排泄之前集中于这里美国传统〔utricle〕A membranous sac contained within the labyrinth of the inner ear and connected with the semicircular canals.小囊，椭圆囊：位于内耳迷路内的细胞膜的囊，与半圆管相连美国传统〔vesicle〕Anatomy A small sac or cyst, especially one containing fluid.【解剖学】 泡囊：一种小囊或泡，特别是包含液体的美国传统〔yolk stalk〕A narrow ductlike part that connects the yolk sac to the middle of the digestive tract of an embryo.卵黄柄：连接卵黄囊和胚胎消化道中部的狭窄的管状部分美国传统 |
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