理论从本质上是对现实的一种抽象的、符号式的表达。
孩子们在学会语言之前，通过面部表情以及咿呀儿语和人交流。
多亏了现代化的灌溉技术，过去只能生长仙人掌和山艾数的地区，现在种上了繁茂的农作物。
Essentially, a theory is an abstract, symbol representation of what is conceived to be reality.
Long before children are able to speak and understand a language, they communicate through facial expressions and by making noises.
Thanks to mordern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could live.
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