第1968期:Scientists grow whole model of human embryo, without sperm or egg

We all start as a single egg fertilised by a sperm, but those steps, going from a group of cells to something you can see and recognise on a baby scan, are poorly understood, so scientists have created embryo models in the lab to explore this crucial time.我们每个人的生命都是从一个受精卵开始的，但从起初的一组细胞发育成婴儿扫描影像中可以看清并辨识出的胎儿，这之间经过了哪些阶段，我们知之甚少，因此科学家们在实验室中创建了胚胎模型，以探索这个关键时期究竟发生了什么。Instead of sperm and egg, they use stem cells. These can become any tissue in our bodies. They're grown in just the right way to mimic a two-week-old human embryo.科学家们用干细胞代替精子和卵子来培育胚胎。干细胞可以分化为体内的各种组织细胞类型。他们精心培育这些干细胞，使其模拟两周大人类胚胎的结构。The researchers hope their work can help improve IVF rates, understand miscarriage and even test which medicines are safe to use in pregnancy.研究人员们希望他们的工作成果能够帮助提高体外受精的成功率、找到导致流产的原因，甚至能够帮助测试怀孕期间使用哪些药物是安全的。词汇表egg 卵子fertilised 受精sperm 精子steps 阶段scan 扫描embryo 胚胎models 模型stem cells 干细胞tissue （人体）组织mimic 模拟IVF 体外受精miscarriage 流产