最大时间范围的频率(例如，晚饭后和周末期间)。
Frequency of the range of maximum times (for example, after dinnertime and during the weekend).
给定时间内出现的最大时间范围是多长和出现的频率是多少。
How long and how often the range of maximum times has occurred within a given period of time?
当局建议，仍然留在20到30公里范围内的居民尽量留在室内，最大程度地减少暴露于幅射的时间。
Homes within 20 kilometers of the plant have been evacuated. People who have remained in a zone between 20 and 30 kilometers have been advised to stay indoors to minimize their exposure to radiation.
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