Predentin
前期牙(本)质, 原牙质
🗣️ 情景例句
have the interview.
去参加这次面谈。
I have just finished my work.
我刚刚完成我的工作。[表示刚刚完成的动作]
Shortly after this the famous H. M. S. Challenger expedition established the study of the sea-floor as a subject worthy of the most qualified physicists and geologists.
此后不久，英国著名的“挑战者”号舰艇对海底的那次考察，把对海床的研究确立为一个值得一流物理学家和地质学家从事的研究课题。