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The removable stoppers allow students to fill them with rice or sand.
学生可通过立方体底部的洞口注入泥沙或食米,让他们学习形状、小和体积等概念.
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Wine makers say cork stoppers in their bottles let the wine age and improve over time.
制酒者说瓶上软木塞让酒味道逐步得到改善.
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Wine bottle stoppers account for 70 per cent of the value of cork producers'sales.
葡萄酒瓶塞的销售额占软木塞制造商总销售额的70%.
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