From her tone of voice, I could infer that she was not pleased with the decision.

infer 是动词，意思是"推断、推论"，指根据已知的事实或证据得出合理的结论。这个词来自拉丁语 inferre，由 in-（向内）和 ferre（带来）组成，字面意思是"带入内部"，引申为"从外部信息中得出内部结论"。