总结：
“greatest”通常用于形容词最高级，后接名词时，需根据语境选择合适的词汇。常见搭配包括“actor”、“achievement”、“moment”等，具体取决于表达的内容。
| 词性 | 常见搭配 | 示例 |
| 名词 | actor | The greatest actor of all time. |
| 名词 | achievement | His greatest achievement was in 2015. |
| 名词 | moment | That was her greatest moment. |
| 形容词 | success | He is the greatest success in his field. |
说明：
“greatest”常用于强调某人或某事在特定领域中的最高水平或最突出表现。使用时需注意搭配的合理性与语境的自然性。
