It is reasonable to infer from his sudden silence and averted gaze that he was not telling the whole truth.

infer 是动词，由前缀 in-（表示"进入"）和词根 fer（来自拉丁语 ferre，意为"携带"）组成，字面意思是"带入（结论）"，即"推断、推论"。指根据已有信息或证据得出合理的结论。