Predentin
前期牙(本)质, 原牙质
🗣️ 情景例句
I retired because... I wanted to be with my family.
我退休是因为……我想和全家人在一起。
That's a good idea.
好主意。
Later it crossed the Channel, riding smoothly over the waves, which presented no problem.
后来气垫船跨越英吉利海峡，平稳地在波浪上方行驶，波浪不再产生阻力。