think、deliberate、meditate、muse、reason、reflect与speculate这些动词均有“思考、判断、思索”之意。
think : 一般用词，指开动脑筋形成看法或得出结论的脑力活动。不着重结论是否正确，见解是否有用。
- I'm thinking about buying a new car.
我在考虑买辆新车。
deliberate : 指缓慢、按部就班地作仔细而认真的思考或判断。
- The jury took five days to deliberate on the case.
陪审团花了5天时间对此案进行了慎重讨论。
meditate : 语气较强，指认真地长时间集中精力进行思考。
- He meditated on the consequences of his decision.
他思索着他的决定会带来的后果。
muse : 通常指漫无目的地猜想。
- I began to muse about/on the possibility of starting my own business.
我开始思忖自己创业的可能性。
延伸阅读：小词详解 | muse
reason : 指根据资料、证据或事实进行推断，作出结论或判断的逻辑思维活动。
- I spent hours reasoning out the solution to the puzzle.
我花了好几个小时才解开这个谜。
reflect : 指回想或回顾，侧重认真而冷静地反复地思考某个问题，尤指对已发生事情的思索。
- She reflected that this was probably the last time she would see him.
她心想这很可能是她最后一次见他了。
speculate : 指推论过程，隐含在证据不足的基础上作出推测或设想。
- 他的突然辞职令同事们不知所措。我们大家都推测过他辞职的原因。
His sudden resignation put his colleagues in a spin. We all speculated about the reasons for his resignation. - 医生们推测他死于头部受击引起的脑溢血。
The doctors speculate that he died of a cerebral haemorrhage caused by a blow on the head.
延伸阅读：小词详解 | speculate
