gastrula
gastrula — 名詞
1. an animal embryo at the point where a ball of cells folds inward, making a cup s
原腸胚
胚胎早期呈杯狀的多層階段
an animal embryo at the point where a ball of cells folds inward, making a cup shape with three layers of cells.
Under the microscope, Roya could see the frog embryo had become a gastrula.
Roya 在顯微鏡下看到，那顆青蛙胚胎已經發育成原腸胚了。
become a gastrula: a stage in embryo growth
Tanvi drew a gastrula in her notebook as a small cup with two walls.
Tanvi 在筆記本上把原腸胚畫成一個有兩層壁的小杯子。
The biology teacher showed Aoi a photo of a chick gastrula.
生物老師拿了一張雞胚原腸胚的照片給 Aoi 看。
collocation: chick gastrula, frog gastrula
Romi's textbook explains that every gastrula has an outer layer and an inner layer.
Romi 的課本說明，每個原腸胚都有外層和內層。
explain + that-clause about gastrula structure
Renata's class compared a plain ball of cells with a gastrula that had folded inward.
Renata 的班級把一顆普通的細胞球和已向內摺的原腸胚做比較。