Essentially,a theory is a abstract,sybolic representation of what conceived to reality.
实质上，理论是抽象的，象征性的事物是来源于现实的。
Long before children are able to speak or understand a language,they communicate throgh facial expressions and by making noise.
在儿童没有能力说和懂得一门语言之前，他们通过面部表情和制造噪音来交流的。
Thanks to modern irritaion,crops now grow abundantly in area where once nothing but cacti and sagebrush could live.
由于现代的灌溉技术，那个区域的农作物生长的很旺盛，曾经除了仙人掌和艾草从外没有任何东西能够在那儿生长。
第一句翻译的也太离谱了！！！