外膜

例句：

1. 1. The chicken was cooked in a pan with the outer membrane intact.
   这鸡肉在用锅煮的时候，外层薄膜完好无损。
2. 2. The scientist removed the outer layer of the sample for analysis.
   科学家为了分析，把样品的外层薄膜去掉了。
3. 3. The outer layer of the plant is where most nutrients are stored.
   植物的外层是储存大部分养分的地方。