种子有一层外壳，包裹着新植物的遗传物质，外壳内部是集中的营养供应。
The seed has an outer coating that surrounds the genetic material of the new plant, and inside this covering is a concentrated supply of nutrients.
视网膜的细胞需要营养供应才能有功能。
The nutritional needs of retinal cells can be a function of supply.
在沿海地区由于从农田流失的肥料增加了营养供应，浮游植物数量有所增长。
There are also phytoplankton increases in coastal zones where fertiliser run-off from agricultural land is increasing nutrient supplies.
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