Saving water is the topic (the thing that is talked about) of our discussion
问题描述：
Saving water is the topic (the thing that is talked about) of our discussion
答
今天，我们的任务，节约用水是讨论的话题。
答
节约用水是今天我们讨论的话题！
答
节约用水是今天讨论的话题（以前也讨论过）