imply和implicate有何區別？

如：Alexander was implicated in the robbery.

亞歷山大與那宗搶劫案有牽連。

imply是暗示的意思，有點隱喻的意思

如：Their failure to reply to our letter seems to imply a lack of interest.

他們沒有回我們的信似乎暗示他們缺乏興趣。