Subunits
n. [计] 子单位；二级单位（subunit的复数）
🗣️ 情景例句
Yes, I am.
是的，我是。
How much is the telephone bill a month?
每个月电话费要多少钱？
He usually stays at home with his pet dog.
他通常跟他的爱犬待在家里。