Osteon
n. [医]骨单位(密质骨构造的基本单位)
🗣️ 情景例句
So, you're an exchange student.
哦，你是一名交换学生。
No. I went to California for a few weeks.
没有。我上加利福尼亚去了几个星期。
She got very angry and started shouting at me.
她气极了，冲我大喊。