定义 / 说明
语域（register）指根据场景、受众和目的选择合适语言。B2 常见选择包括：缩写 vs 全写、短语动词 vs 单词替代、普通词 vs 学术词。比如 it's not possible 在很多语境自然，而正式写作中 it is not possible 往往更合适。良好语域选择不仅让表达“正确”，更让表达“得体”。这是从语法知识走向实际沟通能力的重要一步。
关键规则
- 缩写常见于口语和非正式写作：I'm, don't, it's。
- 正式、审慎、学术语境中常更偏好全写形式。
- 短语动词通常比单词替代更不正式。
- 正式写作常偏好 obtain, increase, assist, therefore。
- 语域要保持一致，避免无理由混搭“很口语 + 很正式”。
例句
- It's not possible to finish today. / It is not possible to finish today. - 今天完成不了。
- We need to find out the cause. / We need to determine the cause. - 我们需要查明原因。
- Can you help me? / Could you assist me? - 你能帮我吗？
- They will put off the meeting. / They will postpone the meeting. - 他们将推迟会议。
- The results were unclear; therefore, we repeated the test. - 结果不明确，因此我们重复了测试。
常见错误
- ❌ The report says, "We'll sort out the issue soon." -> ✅ The report says, "We will resolve the issue soon."
- ❌ It is a formal essay, but the writer keeps using "can't" and "find out" everywhere. -> ✅ In a formal essay, prefer "cannot" and "determine" where appropriate.
- ❌ The email is very formal, but it also says, "Hey, we're gonna fix it." -> ✅ Keep the register consistent: "We will resolve the issue."