Studies in countries such as Ghana and Cameroon suggest many girls at secondary school miss a week of classes when they have their period, or drop out altogether when they reach puberty.
在加纳和喀麦隆等国家开展的研究显示，许多女中学生在例假期间一个星期不去上学，当她们进入青春期，有的甚至辍了学。
The RIAA blames music pirates for a 31-percent drop in the sales of compact discs (CDs) in the first half of 2003 compared with the same period in 2000.
美唱协指责音乐盗版使2003年上半年的CD销量比2000年同期下降了31%。
If the user selects a retention period longer than 60 days in the drop-down, an additional field will be displayed for the user to select an approver (see figure 7).
如果用户在下拉框中选择一个大于60天的保持期，将向用户显示一个附加的对话框，要求用户选择批准人(参见图7)。
Isotopes of carbon in tree rings and beryllium in ice cores show a drop-off in solar radiation during much of the period.
树木年轮的碳同位素和冰核中钚同位素的检测都显示出在上述阶段的大多数时间内太阳辐射能量出现下降。
Even the American market leader, General Electric, reported a sharp drop in third-quarter turbine sales, compared with the same period last year.
甚至美国的电力市场领先者通用电力在第三季度的电机销售量与去年同期相比大幅度下降。
The temperature drop during the Cretaceous period would almost certainly have wiped out an 'abundance' of the world's dinosaurs.
曾经称霸地球显赫一时的恐龙，在白垩纪时代的这次温度巨变中，似乎全都灭绝了。
Many rural people have ignored the rules. And Thailand, by contrast, has achieved a sharper drop in its fertility rate over the same period without such tough measures.
不少农村人选择忽视该政策。相比之下，泰国没有采取如此强硬的措施也在同期达到了控制高生育率的目的。
The researchers also found an 81% drop in reports of both mental and physical fatigue over the same time period.
并且同一时期同时报告精神和身体疲劳的下降了81%。
The rest of the Fed and its chairman, Ben Bernanke, have listened politely but are not ready to drop or even water down the “extended period” language, much less raise rates.
美联储其他成员及其董事长，本.伯南克很耐心的听完了以上意见，但并不愿意放弃甚至是软化自己坚持长期保持汇率不变的立场的态度，更别说是提高汇率了。
Extended to the whole year, the drop in output in the January to March period is now equal to 4.9% - the worst since records began in 1948.
扩大到整个年度，今年一至三月的产出相当于下降了4.9%，为1948年有记录以来最为严重的下降。
Many of its models also look long in the tooth, which largely explains the 46% drop in operating profits in the first half of this year, compared with the same period in 2005.
许多款式也显得过时，这也是为什么与2005年同期相比，其生产利润在今年上半年狂跌46％。
Lots of American and European cities, however, are set to slide sharply over the same period, with cities like Sydney, Singapore and Madrid likely to drop out of the top 30 altogether.
然而，许多欧美城市的排名将同期大幅下滑，像悉尼、新加坡和马德里这些城市很可能完全跌出前30名之外。
Germany's exports dropped 10.6% in November 2008, compared to the same period the prior year — the highest one-month drop since 1990.
德国08年11月份出口额较前月大幅下滑10.6%，为1990年以来的最大单月降幅。
"That's an enormous drop over such a short period of time," Oakes says.
Oakes说“在这样短的时间内，竟然下降了这么多。”
The rise was mainly due to a drop in public-sector employment, where 33,000 jobs were lost over the period.
失业率上升主要有于公共领域就业岗位的锐减，前三个月该领域3万3千个岗位裁员。
During the study period, ST-elevation heart attacks declined by 62%, but the death rate among people who had these severe heart attacks did not drop.
研究期间，ST段抬高型心肌梗死下降62%，但是发生这些严重心肌梗死人们的死亡率没有下降。
To create a period time reference, click the time reference drop-down menu and select either Last completed period or Current period.
要想创建时间段引用，应该单击Timereference下拉菜单并选择Lastcompletedperiod或Current period。
Based on the homogeneous model, the numerical computation for the oscillation period and amplitude of pressure drop type instability was conducted.
根据两相流的均相模型，对压力降型脉动的周期和振幅进行了数值计算。
Gas concentrations drop, and the effective gas drainage period of holes is shortened, because pores and cracks in the coal seam become completely developed after gas drainage.
针对煤层钻孔抽放瓦斯后煤层孔隙裂隙发育致使瓦斯浓度下降，钻孔有效抽放期缩短的技术难题，首次提出二次封孔方法。
A bear market is a steady drop in the stock market over a period of time.
熊市是稳步下降，股市经过一段时间的。
The Journal now has the biggest circulation in the country, surpassing USA Today, which suffered an enormous 17.5% drop in readership over the same period.
这家报纸超过《今日美国》成为全国发行量最大的报纸，后者在这一时期的发行量下跌了17.5%。
A leak is indicated if usage does not drop to zero, at least for a period of time, during a given time interval (e. g., during a 24-hour period).
如果在给定时间间隔(例如在24小时的时段)内，至少一段时间用量未降至零，则指示有泄漏。
These decomposition products will cause the dairy products change relish, drop quality, shorten guarantee period, thus having serious impact on product quality and harming consumer's health finally.
这些分解产物将导致乳制品风味改变、品质降低，保质期缩短，严重影响乳制品的质量，并最终危害消费者的健康。
To the later period of adolescence, growth drop gradually and stop nearly.
到了青春发育后期，长高速度逐渐下降至几乎完全停止。
Fortunately, of all hair "hair grows eventually period" won 't begin at the same time, otherwise the hair can drop light very quickly.
幸运的是，所有的毛发的“毛发生长终期”不会同时开始，否则头发很快就会掉光。
Fortunately, of all hair "hair grows eventually period" won 't begin at the same time, otherwise the hair can drop light very quickly.
幸运的是，所有的毛发的“毛发生长终期”不会同时开始，否则头发很快就会掉光。
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