词汇网络: Hum!

To think about (something) carefully, especially before making a decision.

Reflection, contemplation; serious thought or consideration.

To think, to form ideas in one's mind.

pensive, thoughtful; engaged in deep or serious thought.

Consideration, deliberation; careful thought or reflection.

A feeling of uncertainty or a question that needs an answer.

The action of pausing before saying or doing something; hesitation, reluctance.