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She says one possibility is a decrease in the number of school nurses during the period they studied.
VOA: special.2009.08.06
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And it turns out that simply by counting the number of those spikes that occurs at a period of time.
随后，只要数一数在一定时间内,产生的尖峰脉冲的数量。
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Suppose someone has a contract that promises to pay an amount each period over a number of years.
假设某人有一份合约,承诺在数年内的不同时段内分开支付
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In a similar period starting 18 months after the ban, the number was 237.
VOA: special.2009.01.07
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By the end of the period there was an unprecedented number of new religious groups.
在这段时期末,出现了空前多的新宗教派系。
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Over a four year period, the number of regular opium users jumped 53 percent.
VOA: standard.2010.06.23
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Now what we do is to record the number of those action potentials in some period of time, and plot them on the graph below.
现在，我们要做的是记录,在一定时间内可能做出的动作，在图表中设计出来。
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Okay, well the interesting thing is, you guys in a very short period of time generated a number of ideas about what this could be.
好,有意思的是,大家在很短时间内,猜出了很多种东西
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So, for example, we can move to the next periods in the periodic table. When we talk about a period, we're just talking about that principle quantum number, so period 2 means that we're talking about starting with the 2 s orbitals, period 3 starts with, what we're now filling into the 3 s orbitals here.
我们可以移至周期表的下一个周期,当我们讨论一个周期时，我们仅仅讨论,周期3以我们所填充的3s轨道，开始填充所以周期2意味着,我们从2s轨道谈起，周期3以我们所填充的3s轨道开始填充。
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There were probably a number of firms that, over that ten-year period, went out of business.
在这10年间,可能有很多企业已经破产
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The return, of course, in any given time period is the percentage increase in the portfolio; or, it could be a negative number, it could be a decrease.
当然了，收益率是一定时间内,投资组合的增长率;,也可能是一个负数，表示负增长。
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I bought a number of two-period bonds such that the value of my purchase exactly equals the proceeds that I get from shorting the one period bond, so I've made a zero wealth transaction.
我买入了一定数量的两年期债券,其成本刚好等于我卖空,一单位一年期债券获得的资金,我做的是零成本交易
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