That means it is necessary to segment the individual screens that will be part of the application so that they can be made viewable by the user when needed.
这意味着需要将应用程序中的各个屏幕分隔开，这样才能根据需要向用户显示不同的屏幕。
It returns to its right place, as a useful instrument, which is used when necessary and put aside when not needed.
它回归到恰当的位置，充当有用的工具，用则拿出，不用则收好。
When ozone is used in water treatment, it is necessary to carry out a separation treatment of the off-gas of the ozone, for which a unit that separates ozone from water is needed.
在采用臭氧处理水时，需对臭氧尾气进行分离处理，因而需要臭氧与水分离的装置。
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