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荷兰人给非洲人出点子，让他们在地里到处挖坑，这能有什么用处？
荷兰人简直太奇怪了，别的国家跑去非洲，要么是教他们种粮食，要么是带他们挖矿，但是荷兰人却带着他们到处刨坑。荷兰人为什么要跑去非洲刨坑？这些土坑有什么用处？
不可思议的科普39/71
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