[名词解释] gametogenesis (配子发生)

embryonic induction (胚胎诱导) cytoplasmic determinants (细胞质决定子) 攻一M12mm×1.5mm不通孔螺纹，所需螺孔深度H为15mm，求钻孔深度是多少？ cell differentiation (细胞分化) individual development (个体发育) gametogenesis (配子发生)