英语词汇系统中存在特殊语义现象：某些单词在不同语境下呈现完全相反的含义。这种现象既可能造成理解障碍，也体现着语言发展的历史轨迹。准确掌握这类词汇需要结合具体语境，观察其在不同句式中的语义变化。
| 词汇 | 正向含义 | 反向含义 |
|---|---|---|
| sanction | 官方批准 | 经济制裁 |
| overlook | 监督审查 | 疏忽遗漏 |
当母亲擦拭书架灰尘时："Dusting the bookshelves requires careful attention to corners"
烘焙时撒糖粉的场景："Dust the dessert with powdered sugar before serving"
物理分割场景：The woodsman cleft the log with precise axe strokes
情感依附场景：The couple cleaved to their shared values throughout difficulties
仔细审阅：Scanning the contract for hidden clauses
快速浏览：Scanning the newspaper headlines during breakfast
常规帮助：Helping the elderly carry groceries
强制控制：Couldn't help laughing at the comedian's witty remarks
