The government is not simply relying on trickle-down economics to tackle poverty.政府并没有仅仅依赖垂滴经济学来解决贫困。He learned everything he knew from his predecessor.他所知的一切都是从前任那里学来的。He copied that mannerism from his brother.他从他哥哥那里学来了这个习惯。That's a pretty song - where did you learn it?那首歌真好听，你从哪儿学来的?