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Science STUDY

World is running out of sand

Without sand, construction will become more difficult. TNS
作者:TEENS
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人类下一个资源危机:沙子即将被耗尽。

词数 270 测试见IV版 建议阅读时间 7分钟

From deserts (沙漠) and beaches to playgrounds, sand is a common sight. But you might not know that sand is also a useful resource (资源).
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