外壁层

茎、叶表皮细胞都有较厚的外壁和角质层。

The epidermis cells of stem and leaf have comparatively thick outer wall and cuticle .

茎和叶的表皮细胞外壁还有角质层。

The outer wall of epidermal cells of stem and leaf has the thicker cuticle .

L.tridentata叶片厚，表皮细胞大，具有较厚的表皮细胞外壁与角质层，栅栏组织发达。

It has big epidermal cells and a thick cell wall and cuticle . Its fences organizations is developed .

高能量粒子穿透太空船外壁或保护层，停留在微电子装置或太阳能电池的介电质半导体材料中时，往往会发生毁灭性的电荷积聚现象。

This destructive charge buildup can occur when high-energy particles penetrate spacecraft walls or protective shielding and then bury themselves in the dielectric semiconductor materials in Microelectronics or solar cells .

外壁由几层组成：上部均质层，具不平的外、内表面，中间均质层，穴状层和下部均质层。

It consists of the following layers : the upper homogenous layer , with uneven external and internal surfaces , the intermediate homogenous layer , the alveolate layer , and the lower homogenous one .

管道腐蚀包括外壁由于保护层的破坏而产生环境腐蚀，内壁由于输送高温、高压、高腐蚀性介质遭受介质腐蚀。

Pipe corrosion includes the environmental corrosion of the outer wall as a result of protection layer destruction , corrosion of internal wall because of conveying high temperature , high pressure and high corrosive medium .

管道外壁的防腐保护层被破坏，又使外壁腐蚀速度加快，造成穿孔。

The damage of anticorrosive layer of pipe outer wall quickens the corrosion of the outer wall , and eventually causes a puncture .