A man was seen prowlingaround outside the factory just before the fire started.
就在起火之前,有人看到一个男子在工厂外踱来踱去。
《牛津词典》
2
If something goes wrong—a hungry lizard prowlingaround for an ant snack, for instance—then a rush of ants returning without food sends waiting reserves a "Don't go out" signal.