"at least"是一个常用的副词短语，用来表示数量、程度或范围的最小值，也可以用来缓和语气或提供安慰。以下是对"at least"用法的总结和一些例句：
★★★表示数量或程度的最小值
- 用于说明数量、时间、程度等不是更少。
- We need at least three people to start the meeting.
- She has been working here for at least five years.
- The temperature should be at least 20 degrees Celsius for the experiment.
★★★表示范围或条件的最小要求
- 用于说明某个条件或范围的下限。
- You must be at least 18 years old to vote.
- Applicants should have at least a high school diploma.
★★★缓和语气或提供安慰
- 用于减轻负面信息的影响或提供某种程度的安慰。
- I know you're disappointed, but at least you tried your best.
- The car is totaled, but at least no one was hurt.
★★★强调最低限度
- 用于强调某个事实或情况的最低限度。
- At least he called to apologize.
- At least we know where the problem is, so we can start working on it.
★★★用于比较
- 用于比较两个或多个事物，指出至少有一个是真实的或可能的。
- At least the weather is better here than in my hometown.
- At least one of the options should work.
★★★例句
- At least ten people have applied for the job.
- At least you have a place to stay tonight.
- At least he's honest about his mistakes.
- The train is late, but at least it's not cancelled.
- I can't afford a new car, but at least my old one still runs.
- At least two hours of exercise per week is recommended for good health.
- At least part of the problem is due to poor communication.
在使用"at least"时，需要注意它通常位于它所修饰的词或短语之前，但在句子中的具体位置可以根据句子的结构和强调的需要而变化。