她对在学高数前学代数感到遗憾，并且一直在与教育工作者们争论这一教学顺序是否合理的问题。
She regrets that algebra was required before higher math and continues to argue with educators who are fixed on that curriculum sequence.
某些患上阿尔茨海默氏症的志愿者，其血液中一种名为妊娠带蛋白的物质含量非常高，甚至在症状出现前也是如此。
Levels of a substance called pregnancy zone protein had been unusually high, even before their symptoms appeared, in some of those who went on to develop Alzheimer's disease.
哥伦比亚是前10名中最贫穷的国家，其高排名源于其得天独厚的自然资源质量。
The poorest country in the top 10, Colombia's high ranking is due to the quality of its natural endowments.
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