名词
中文翻译：外层
同义词：
['outer layer', 'outer envelope例句：1. The pericycle is the outer layer of a plant cell that contains chloroplasts.（外层是植物细胞的外层，包含叶绿体。）2. In the pericycle', 'the cells are arranged in a spiral pattern.（在周皮中，细胞排列成螺旋状。）']
例句：
-
1. The pericycle is the outer layer of a plant cell that contains chloroplasts.
外层是植物细胞的外层，包含叶绿体。
-
2. In the pericycle, the cells are arranged in a spiral pattern.
在周皮中，细胞排列成螺旋状。
-
3.The pericycle plays a crucial role in the growth and development of plants.
周皮在植物的生长和发育中起着关键作用。