If someone purloins something, they steal it or borrow it without asking permission.
例句
Each side purloins the other's private letters.双方彼此都偷对方的私人信件。
英汉词典释义
vt.
偷窃
Japan and Korea purloin American technology as it comes off the drawing boards with the help of their governments.日本和韩国，在他们政府的帮助下，只要美国的技术一离开设计图板就把它偷走了。