stay remain和keep

stay: [ stei ] . .
　　n. 停留,停止,依靠
　　v. 停留,留宿,制止
　　1. A fold made by pressing a groove into paper stock without cutting its fibers.
　　中义在纸张上压出一道凹痕形成折线，但不至压断纤维。
　　www.ptri.org.tw
　　2. A machine processable information storage medium of special quality paper stock, generally 7×3 inches.
　　一种特质纸片做的机器可处理的信息存储介质,一般尺寸为7×3英寸。
　　dictionary.sina.com.tw
　　3. Our business scope mailnly involves manufacture and sales of finely processed paper products, including a wide variety of high-grade exercise books, copy paper, stock forms, and shopping bag etc.
　　主要生产销售各类高档薄本、影印纸、电脑报表纸、购物袋等深加工纸制品。
　　remain: [ ri'mein ] . .
　　v. 保持,依然,剩余,留下，逗留
　　n.遗迹，剩余物，残骸
　　1. When the others had gone, Mary remained and put back the furniture.
　　当其他人走了之后，玛丽留下来，将家具放回原处。

　　2. Our plan must remain a secret.
　　我们的计划必须保密。

　　3. You are wise