prowl

n. 潜行,徘徊,悄悄踱步
v. 潜行以觅食,窥伺,逡巡于

He saw a hungry wolf on the prowl with his telescope.

他通过望远镜看到了一头四处觅食的饿狼。

I saw someone prowling around among the trees.

我见有人在树林里鬼鬼祟祟地走动。