Osteon
n. [医]骨单位(密质骨构造的基本单位)
🗣️ 情景例句
Are the people friendly in China?
中国的人们友好吗？
True coral needs no painter's brush.
真珊瑚无需刷油漆。
She watched TV for half an hour after supper. Then she started her homework.
晚饭后她看了半小时电视。然后她开始做家庭作业。