"Keep quiet" 或 "maintain silence" 是保持安静的常用说法。
来源：这两个短语都源于英语中 "keep" 和 "quiet" 的组合，"keep" 意为 "保持"，"quiet" 意为 "安静"。
英文例句及中文翻译：
Keep quiet during the exam. (考试期间保持安静)
Please maintain silence in the pbrary. (请在图书馆保持安静)
Can you keep it down? I'm trying to study. (你能安静一点吗？我在学习)
The teacher told the students to keep quiet. (老师告诉学生们保持安静)