We will have no water to drink unless we learn to save water.(保持句意不变)We will have no water to drink _____we ____learn to save water.

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We will have no water to drink unless we learn to save water.(保持句意不变)We will have no water to drink _____we ____learn to save water.
We will have no water to drink unless we learn to save water.(保持句意不变)
We will have no water to drink _____we ____learn to save water.

We will have no water to drink unless we learn to save water.(保持句意不变)We will have no water to drink _____we ____learn to save water.
We will have no water to drink __if ___we __don't__learn to save water.
意思是 如果我们不懂得节约用水的话 我们将没有水可以喝