Maintenance prevention
[化] 安全措施; 安全设施
🧩 词语组成解析
🗣️ 情景例句
They know that I'm married and that I have a family.
他们知道我结婚了， 有一个家。
Not only did he make a promise, but he also kept it.
他不仅许下诺言，而且遵守了。
Thank you, doctor, said Mrs. Brown.
“谢谢你，医生，”布朗夫人说。