存留时间是指一个具有物质带入或带出的开放体系本身或其中某种组分（元素、同位素等）所能存在的平均时间。
这是因为中纬度和高纬度地区的林木线受到积雪存留时间和厚度的强烈影响。
This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover.
在定期随访的情况下，可适当延长硅油在眼内的存留时间。
In the followup on a regular basis, we can appropriately extent the remaining time of intraocular silicone oil.
搅拌后的砂浆在机器、管子和搅拌桶中存留时间不可超过24小时。
The mixed plaster must not be left in plastering machines or tools, hoses and mixing vessels for more than 24 hours (e. g. over the weekend). Note!
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