
好词典

源自拉丁语 placenta(意为“蛋糕”),因哺乳动物胎盘形状类似扁平圆饼而得名。17世纪首次用于生物学。
❶ 胎盘是哺乳动物妊娠期间形成的器官,连接母体与胎儿,负责氧气、营养和废物的交换。
“The placenta provides oxygen and nutrients to the developing baby.”
(胎盘为发育中的婴儿提供氧气和营养。)
“After birth, the placenta is usually expelled from the mother's body.”
(分娩后,胎盘通常会被排出母体。)
❶ 在植物学中,胎盘指子房中胚珠着生的部位,是种子发育的基础结构。
“The placenta in flowers is where the ovules are attached.”
(花的胎盘是胚珠附着的地方。)
“Botanists study the placenta to understand seed development.”
(植物学家研究胎盘以了解种子发育。)
placenta previa — 胎盘前置,指胎盘部分或完全覆盖宫颈口,可能导致分娩时出血的妊娠并发症。
“She was diagnosed with placenta previa and required bed rest.”
(她被诊断出胎盘前置,需要卧床休息。)
placental barrier — 胎盘屏障指胎盘中选择性过滤物质的结构,保护胎儿免受有害物质影响。
“The placental barrier prevents many toxins from reaching the fetus.”
(胎盘屏障阻止许多毒素到达胎儿。)