Be obsessed with: to have a complete preoccupation with someone or something(to an extent that seems extreme to others); to completely fill your mind with something so that you cannot think of anything else, in a way that is not normal.(使痴迷；使迷恋；使着迷).
中文释义：be obsessed with 经常用来表达某人对” 某事物着迷”或者 对“某个人痴迷”。例句：We should not be obsessed with smartphone all day.（我们不能整天沉溺于智能手机）。另外还有一个和“obsessed”意思十分相近的词“infatuated ”，它的意思是入迷的；着迷的，热恋的，昏头昏脑的。相关例句：Those infatuated fans stalked the celebrity madly.（那些着了迷的崇拜者疯狂地追踪这位名人）。
be crazy about（对…痴迷，疯狂）
be hooked on（对…入迷，着迷）
be addicted to（对…上瘾；沉溺于）