come up with (an idea, plan, explanation, theory, or principle) after a mental effort
同义词：invent??/??contrive??/??devise??/??formulate??/??forge
reflect deeply on a subject
同义词：chew over??/??think over??/??meditate??/??ponder??/??contemplate??/??muse??/??reflect??/??mull??/??mull over??/??ruminate??/??speculate
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。