正如网友所言，几部主流词典都把peek处理为不及物动词。
在The American Heritage Dictionary of the English Language中对peep一词这样处理：
v. tr. To cause to emerge or become partly visible: He peeped his head through the door.
外国论坛也有过讨论，不过，结果不太尽如人意，可参考：
https://forum.wordreference.com/threads/transitive-peep-vs-peek.3460721/post-17559325
