交流电是其方向周期地变化的电流。
Alternating current is the current whose direction changes periodically.
周期地或者好象周期性地运动。
他们满不在乎地说，房地产业就是周期性的嘛。
这样，系统即可在其有用的生命周期中安全地进行修复和重构。
Then, the system can be safely repaired and refactored throughout its useful life.
确切地讲，这个集成的工具包是用来支持IT生命周期管理吗？
You say they're designed to support IT lifecycle management. What is that, exactly?
为了准确地预测未来，你必须了解主要周期。
In order to be accurate in forecasting the future, you must know the major cycles.
能力具有一定的生命周期，需要根据环境的变化适时地进行变革。
Capability has some life cycle and it need change with the environment changing.
分析了全球陆地平均的年、季降水序列的周期和趋势特征。
We analyzed the time series of global land average annual and seasonal precipitation.
分析了全球陆地平均的年、季降水序列的周期和趋势特征。
We analyzed the time series of global land average annual and seasonal precipitation.
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