膜的

例句：

1. 1. The cell membrane is responsible for separating the inside and outside of the cell.
   细胞膜负责分隔细胞的内部和外部。
2. 2. The skin acts as a protective barrier against harmful substances.
   皮肤作为保护屏障，抵御有害物质。
3. 3. The film was so thin that it barely covered the surface.
   那部电影太薄了，几乎没遮住画面。