英语作文50字左右 save water
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发布时间：2024-10-24 16:18
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时间：2024-11-14 21:02
The world is not only hungry,but also thirsty for water. This may seem strange to you, since nearly 75 % of the earth's surface is covered with water. We all have to learn how to stop wasting our precious water. One of the first steps we should take is to develop ways of reusing it. eriments have already been done in this field, but only on a small scale. For us, the systems are as important as the spacecraft.
