介词短语是英语中非常重要的语法结构，它们在句子中起到连接、修饰的作用，能够丰富表达，增强语言的精确性。以下是一些常见的英语介词短语及其用法：
1. **At (a) high speed**: 表示以高速度进行，常用于描述快速移动或做事的情况。
2. **At (the) risk (of)**: 暗示某人冒着可能发生的危险去做事，如：She went into the burning building at the risk of her life.
3. **At / by one’s side**: 通常表示陪伴或支持，如：My friend stood by my side during difficult times.
4. **At / for a fraction of**: 以极小部分的价格或代价，常用来表示便宜或物有所值，如：You can get this high-quality product for a fraction of its original price.
5. **At / from the outset**: 从一开始，用于描述事情的起始阶段，如：From the outset, we knew it would be a challenging project.
6. **At / in the end**: 用于总结，如：In the end, all their hard work paid off.
7. **At / on sight**: 一看到...就...，如：She laughed at the sight of the funny clown.
8. **At / on the double**: 非常快地，立刻，用于强调迅速行动，如：Run on the double, we're running out of time!
9. **At a / one time**: 曾经，一度，如：This used to be a busy marketplace at one time.
10. **At a disadvantage**: 处于不利地位，如：Being unfamiliar with the rules put him at a disadvantage.
11. **At a discount**: 打折，降价，如：The store is selling all items at a discount.
12. **At a distance**: 在远处，如：I could see the mountain peak at a distance.
13. **At a glance**: 一眼看去，如：She recognized him at a glance.
14. **At a guess**: 猜测，估计，如：The room probably measures 20 square meters at a guess.
15. **At a loose end**: 无所事事，不知道做什么，如：I feel a bit at a loose end during weekends.
16. **At a loss**: 不知所措，困惑，如：He was at a loss for words when he heard the news.
17. **At a low ebb**: 在低谷，状态不佳，如：His confidence was at a low ebb after failing the exam.
18. **At a moment’s notice**: 随时，立即，如：The soldiers must be ready to move at a moment's notice.
19. **At a price**: 付出代价，如：Success often comes at a price, such as long working hours.
20. **At a rate of**: 以...的速度，如：The car was moving at a rate of 100 kilometers per hour.
这些只是介词短语的一部分，学习英语时，掌握这些常用的介词短语能极大地提升语言的流畅性和准确性。继续深入学习，你会发现更多丰富多彩的表达方式，从而更好地运用英语进行沟通。
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