內細胞團

inner cell mass (ICM)

inside / inner / internal / within / interior

thin or slender / finely particulate / thin and soft / fine / delicate / trifling / (of a sound) quiet / frugal

cell (biology)

placenta / womb / born of the same parents

round / lump / ball / to roll into a ball / to gather / regiment / group / society / classifier for a lump or a soft mass: wad (of paper), ball (of wool), cloud (of smoke)