Create new layer on top of the time indicator background.
创建对当时背景上的新指标层。
An important thing is monitoring the size of the hole in the zone layer above Antarctica, since this is an indicator of global ultra-violet radiation levels.
监测南极上方臭氧层空洞的大小是一件重要的事，因为它是全球紫外线辐射水平的一个指示器。
When the thickness of the spreading layer changes, the mounting position of the level indicator does not need to be changed and adjusted.
铺层厚度变化时，料位仪的安装位置也不需要变化、调整。
When the thickness of the spreading layer changes, the mounting position of the level indicator does not need to be changed and adjusted.
铺层厚度变化时，料位仪的安装位置也不需要变化、调整。
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