learn about 了解到
比如：I learned about her accident via her sister.我通过她姐姐,了解了她的事故
think of 想起,想到； 考虑
比如 I often think of my best friend when i see the picture.
当我看到这张照片时,我经常想起我的好朋友.
What are you thinking of?你在考虑什么?