outermost

Last is the exosphere, which is the outermost layer of the atmosphere.

散逸层，这大气外层。

The term epiblem is sometimes used instead to denote the outermost layer of cells in the root.

有时用根被皮这一名称来表示根外层细胞。

Bark The outermost tissue of the stem and roots in woody plants, on the outside of the phellogen (cork cambium).

木本植物中茎或根中木栓形成层外方全部组织，称为树皮。

Exodermis An outermost layer of thickened or suberized cortical cells that sometimes replaces the epidermal layer in the older parts of roots if the epidermal cells have died.

薄或木栓化皮层细胞外层。如果根较老部分表皮细胞死亡，它通常取而代之。

New Horizons' trailblazing journey to the solar system's outermost frontier took it past the orbit of Mars today at 6 a.m. EDT , 78 days after the spacecraft launched.

新地平线打响了探索太阳系边疆第一炮，而在今天美国东部时间早上6点，在发射了78天它成功跨越了火星轨道。