Machine maintenance
[化] 机器保养; 机床保养\\n[经] 机器维修
🧩 词语组成解析
🗣️ 情景例句
Do you speak a foreign language?
你会讲外语吗？
An empty sack cannot stand upright.
空麻袋，立不直。
When it has been decided where we are going to drill, we put up at the surface an oil derrick.
当确定钻孔地点后，我们就在那里竖起一个井架。