"Out of sight, out of mind" 意思是看不到实物就会忘记它。这个短语最早出现在17世纪英国作家 John Heywood 的戏剧作品中。
例句：
"I haven't seen him in months, he's out of sight, out of mind for me now." (他月没见了，现在我已经把他忘了。)
"She always says that out of sight, out of mind, but I know she still thinks about him." (她总是说看不到就忘记，但我知道她仍然在想他。)