从本质上讲，一种理论是现实包含的一种抽象的，符号化的表达。
在幼儿能够讲或者理解一门语言之前，他们是通过脸部表情以及哭喊来交流的。
多亏了现代灌溉技术，这个地区的农作物如今长的很茂盛，而在过去这个地方只有仙人掌和山艾树才能存活。
Essentially,a theory is an abstract,symbolic representation of what is conceived to be reality.
Long before children are able to spake or understand a language,they communicate through facial espresstion and by making noises.
Thangks to morden irrigaration,crops now grow abundantly in areas where once nothing but cacti and sagebrush could live.
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