Be strongly obsessed with sb

obsess v.使痴迷；使迷恋

He was obsessed with the American films.

他疯狂的迷上了美国电影。

另外，obsessed也可以替换成其他类似的单词：

be fascinated by someone

be crazy about sb

be crush on sb

都表示对某人"一见倾心;疯狂迷恋"

On the spur of the moment 一时冲动，冲晕了头脑；不够理智

这个短语大家可能比较陌生，但是它在《生活大爆炸》中出现过。

On the spur of the moment，he asked her to marry him.

一上头，他就向她求婚了。

go to one's head

使...冲昏头脑；使...飘飘然

Please never let fame and money go to your head.

请不要被名气和金钱冲昏了头脑。

The excitement went to his head.

兴奋的太上头了！