For corn and soybean farmer Wayne Fredericks in Osage, Iowa, the monarch's seemingly vulnerable life cycle is a mystery.
当你每个月开始你的月经周期时标记你的日历,这样你可以看到你的周期是多久。
Mark the start of your period in a calendar from month to month and find out how long your cycle is.
贾菲说,100天的周期是为实验选择的任意时间长度,较长的培养时间可能导致更多的PFAS去除。
Jaffe said the 100-day period was an arbitrary length of time selected for the experiment, and that longer incubations might result in more PFAS removal.
选择这样的周期是为了限制日食的次数,日食时“门廊”将被地球或月球的阴影所笼罩。
This period was chosen to limit the number of eclipses, when the gateway would be shrouded by the Earth's or the Moon's shadow.
其中一个问题,尽管短期的周期是通配符波动的市场使它更是一个随机的运气。
One problem though with short-term cycles is the wild fluctuation of the market making it more a matter of random luck.
本例中,若振荡器的周期是0.05秒,则其频率是1÷0.05秒,即每秒钟20个循环。
In this case, if one cycle takes 0.05 seconds, then 20 cycles occur every second….
目前的审查周期是用于这一目的的良好手段,因此我们必须尽力确保2005年审查会议产生积极的成果。
The current review cycle is a good instrument for this purpose and we must do what we can to ensure that the 2005 Review Conference has a positive outcome.
The current funding cycle was one of the primary concerns raised by respondents in the project survey; throughout the survey, grantees repeatedly raised the difficulties it causes them.
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