1.本质上，理论是抽象的，象征所代表的是被事实孕育的。
2。儿童能说或者理解一种语言之前，他们通过面部表达和一些声音交流。
3。真感谢现代灌溉技术，玉米在仙人掌和山艾树能存活的地方也可以大量生长。
1。Essentially,a theory is an abstract,symbolic representation of what is conseived to be reality.
2.Long before children are able to speak or understand a language,they communitate through facial expression and by making noise.
3.Thanks to mordern irragation,crops now grow abundantly in areas where once nothing but cite and sagebrush could live.
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