房屋销售总额在一线城市的地区在今年上半年比前年下降百分之五十，而价格上升。
The total home sales areas in first-tier cities in the first half of this year declined 50 percent over the previous year, while prices increased.
该研究的作者说：研究中每日食用推荐的五种或更多的蔬菜水果并进行适度体育锻炼的女性的死亡风险下降百分之五十。
Women in the study who ate the recommended five servings or more a day of vegetables and fruits and exercised moderately cut their risk of death in half, according to the study authors.
通常情况下，这个曲线达到顶点时，是能源储备的百分之五十枯竭的时候，在此之后根据回报递减的规律，产量不可逆转地缓慢下降。
Typically, the peak of this curve occurs when reserves are 50 percent depleted, which is followed by an irreversible slow decline in production following the law of diminishing returns.
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