By the end of the study, 180 people had Alzheimers.
在试验结束的时候，180名老年人换上了老年痴呆症。
By the end of the study, that percentage had decreased by half, to 45 percent.
在研究结束时，这个百分比下降到了一半，即45%。
She hoped to finish her overseas study by the end of the year.
她希望能在年底完成在国外学习的任务。
She hoped to finish her overseas study by the end of the year.
她希望能在年底完成在国外学习的任务。
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