If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning.
如果这个理论是正确的，那么吸入含有额外二氧化碳的空气应该会引起打哈欠，而吸入纯氧应该可以抑制打哈欠。
Based on the features of pure cotton of extra high count fabric, this paper analyses the difficulties in weaving process and puts forward some technical measures in practice.
根据纯棉特高支织物的特点，分析了织造工艺的难点，提出了在生产实践中应采取的技术措施。
"Pure" olive oil is made by adding a little extra virgin olive oil to refined olive oil.
纯橄榄油是添加了少量特级初榨橄榄油来精炼的橄榄油。
Scientists who study matter are fascinated by the unusual properties of supercooled materials, while food scientists have used supercooling to make shinier chocolate and extra-pure vodka.
超冷处理的材料具有一些非同寻常的特性，材料科学家为此而着迷，而食物科学家则已经使用超冷技术制做出更有光泽的巧克力和超纯的伏特加酒。
Scientists who study matter are fascinated by the unusual properties of supercooled materials, while food scientists have used supercooling to make shinier chocolate and extra-pure vodka.
超冷处理的材料具有一些非同寻常的特性，材料科学家为此而着迷，而食物科学家则已经使用超冷技术制做出更有光泽的巧克力和超纯的伏特加酒。
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