Machine hours
[化] 机器运转时间
🧩 词语组成解析
n. 小时（hour的复数形式）
🗣️ 情景例句
What?
什么办法？
A friend is never known till a man have need.
不到患难时，永远不能认识真正的朋友。
She likes the children to read newspapers and books in the reading room.
她喜欢孩子们来阅览室读书看报。