Security maintenance
[计] 安全维护
🧩 词语组成解析
🗣️ 情景例句
In two or three months, I'll have an advance on my book
两到三个月后 我能得到我那本书的预付款
He knows much who knows how to hold his tongue.
懂得缄默的是明白人。
The film was set in California in the middle of the nineteenth century.
这部影片是以19世纪中叶加利福尼亚为背景的。