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如果我们可以制造出变废为油的机器人，世界将会怎么样？
What if we could build robots that turn waste into fuel?
youdao
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他的头发已经变灰了，于是他在上面抹油让它闪亮。
His hair had turned gray, so he put grease on it to make it shiny.
youdao
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他的头发已经变灰了，于是他在上面抹油让它闪亮。
His hair had turned gray, so he put grease on it to make it shiny.
youdao