Timing of this type is always subject to some variation, so the import command to grab the clock image is run in the background, leaving the main shell free to keep time.
这种类型的计时总是会发生变化，因此将获取时钟图像的import命令放在后台中运行，从而避免使用主要的shell脚本跟踪时间。
Objective: To explore the seasonal and circadian variation in the timing of cerebral hemorrhage.
目的：揭示脑出血发病时间的季节周期性和日变化规律。
The main factor influencing variation in RWL was water regimes, relating to timing and intensity of water stress.
影响RWL变化的主要因素是水分，与水分胁迫的时间和强度有关。
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