build 和 build up 主要是意义和用法不同。build : 普通用词，含义广泛，可指一切具体或抽象的建造或建立。build up 常做动词，表示增强，介词for后面常接动名词：building up。
build up用法:
build up (to sth)加大、加强、增多：The music builds up to a rousing climax.音乐逐渐达到了令人振奋的高潮
build up to sth/build yourself up to sth为……作准备：Eg：Build yourself up to peak performance on the day of the exam.好好准备在考试那天发挥出最高水平
build sb/sth up吹捧、鼓吹：Eg：The play was built up to be a masterpiece but I found it very disappointing.那部戏被捧为杰作，可我却大失所望
build sb/yourself……up增强……的体质：Eg：You need more protein to build you up.你得多次蛋白质以增强体质
build sth up建立，开发：Eg：These finds help us build up a picture of life in the Middle Ages.这些发现有助于构建中世纪的生活画面。
build用法：
建，筑，建筑，营造，建造，修建，盖：They are building a house.他们正在盖一所房子
建立，创立，创办，创建，设立，建设(常与up连用)：We have built up our hope.我们已抱有希望了
创立(学说等)，确立证实：to build a theory on facts.以事实为基础创立理论
建设，建立：Rome wasn't built in a day.[谚语]罗马非朝夕建成。
