名词
中文翻译：如果切换同义词
同义词：
['if', 'when', 'if only', 'should have', 'could have', 'might have']
例句：
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1. If you switch to a different brand of shampoo, your hair will feel smoother.
如果你换用另一种品牌的洗发水，你的头发会感觉更光滑。
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2. If I had known about the new policy earlier, I would have signed up for it sooner.
如果我早知道新政策，我会早点报名参加的。
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3. If only we had more time to spend together!
如果我们有更多时间在一起就好了！