Today you learned how your unsung epithelial tissue creates the inner and outer boundaries that keep you alive.

今天你们学到了无名的上皮组织是如何创造内部和外部边界，让你们活着的。

And just like that chaotic cafeteria packed with middle-schoolers -- we'd be hopeless messes without our hierarchy of organization, our inner and outer boundaries, and the ability of our systems to communicate with each other.

就像那个挤满了中学生的混乱的自助餐厅，如果没有组织层级，我们的内外界限，以及我们的系统相互沟通的能力，我们会变成一团糟。

She pushed her way through the laurel bushes, sheltering her bonnet with the shawl as an additional safeguard, scrambled over an inner boundary, went along through more shrubberies, and stood ready to emerge upon the open lawn.

用披肩遮住帽子作为额外的保护， 她爬过内部边界， 穿过更多的灌木丛， 准备出现在开阔的草坪上。