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。
The diurnal variation of concentration of background desert aerosol is mainly controlled by air disperse dilution.
背景沙漠气溶胶浓度的日变化主要由大气扩散稀释能力控制。
Some factors such as oblique beam radiation and background intensity variation are also further discussed. These factors can decrease the precision of measure system.
讨论了斜光束照射、背景光强变化等因素，这些因素降低了系统的测量精度。
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