Pregastrulation
原肠形成前期
🗣️ 情景例句
He ventured to speak to her.
他鼓起勇气向她说话。
Eat to live, but not live to eat.
吃饭是为了生存，但生存不是为了吃饭。
Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing.
藏书使教育成为可能，而教育反过来又丰富了藏书，因为知识的增长遵循着一种“滚雪球”的规律。印刷术的发明又大大提高了知识增长的速度。