The outermost surfaces of plants are covered with an epicuticular wax layer that provides a primary waterproof barrier and protection against different environmental stresses.
植物最外表面被一层上皮蜡质层所覆盖，是防止水分丧失的主要屏障和保护植物免受不同环境胁迫伤害的壁垒。
2
In addition, elaborate primary and secondary stresses acted on pipes from the support and hanger, as well as importance of correct setting u...
此外还介绍支吊架对管道产生的一次应力和二次应力，并说明在管道设计中正确设置支吊架的重要性。
3
Family practice (or family medicine or general practice) : Field of medicine that stresses comprehensive primary health care, emphasizing the family unit.