Security administration
[计] 安全管理
🧩 词语组成解析
🗣️ 情景例句
There are abundant free materials available on the internet.
因特网上有丰富的免费资料提供。
Has everybody got a sheet?
每个人都拿到材料了吗？
The village no longer existed because it had been submerged, and all the valley too.
村庄已不复存在，因为已经为水所淹，山谷也被水淹没了。