to believe especially on uncertain or tentative grounds
同义词：speculate??/??theorise??/??conjecture??/??hypothesize??/??hypothesise??/??hypothecate??/??suppose
construct a theory about
form or construct theories
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。