Presas普雷萨斯Presabbr.主席；总统(=President)abbr.现在(=present)preselective control预选操纵Preservation tillage保护性耕作presacral neurectomy骶前神经切除术presenility syndrome早期衰老综合征prestimulatory stage刺激前期prestress stretching预应力张拉presynaptic terminal突触前末梢prestress technology预应力技术prestressed concrete钢筋混凝土preservice education师范教育