Echelle
阶梯(分级)光栅
🗣️ 情景例句
Are you having a good time, Susan?
玩得高兴吗， Susan？
Water dropping day by day wears the hardest rock away.
水滴天天滴不停，石头最坚也磨损。
The other students in the class keep their eyes closed.
班里其余学生一直闭着眼。