Osteomere
单骨, 骨件
🗣️ 情景例句
when I was about eighteen years old.
那时我差不多十八岁。
This is my fourth year of college, I'm a senior.
这是我上大学的第四年，我是四年级学生。
Some cakes, please.
吃几块蛋糕吧。