"at least"是一个副词短语，它可以放在句中的不同位置，具体取决于它所修饰的成分和句子的结构。以下是一些常见的情况：
1. 放在句首：
At least five people were injured in the accident.
2. 放在主语之后：
Five people at least were injured in the accident.
3. 放在动词之前：
Five people were at least injured in the accident. (这种用法较少，通常是为了强调"至少"这个概念)
4. 放在形容词或副词之前：
The meeting lasted at least two hours.
5. 放在名词之前：
We need at least three more volunteers.
6. 放在句末，通常用于强调：
I've told you at least a hundred times.
7. 放在从句中：
Make sure you eat at least three times a day.
根据上下文和强调的需要，"at least"可以灵活地放置在句中的不同位置。