to believe especially on uncertain or tentative grounds

同义词：theorize??/??theorise??/??conjecture??/??hypothesize??/??hypothesise??/??hypothecate??/??suppose

talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion

reflect deeply on a subject

同义词：chew over??/??think over??/??meditate??/??ponder??/??excogitate??/??contemplate??/??muse??/??reflect??/??mull??/??mull over??/??ruminate

invest at a risk

同义词：job