「未定」英文怎么说？up in the air
up in the air = 未定（惯用语）
up in the air 是什么意思？
up in the air：未定。出自主题「母语人士超爱用的惯用语」。
例句
- Our plans are still up in the air.
- Not yet, it's still up in the air.还没，目前悬而未决。出自 别再字面直译！
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同主题还有
| sit tight | 耐心等待 |
| a grain of salt | 半信半疑 |
| the last straw | 忍无可忍 |
| through thick and thin | 同甘共苦 |
| when pigs fly | 不可能 |
| wrap my head around | 理解 |
| a blessing in disguise | 因祸得福 |
| a dime a dozen | 多得是 |