它才发现英语怎么说

“它才发现”是指在这之前，这个人或物没有发现某件事。这个短语在英语中可以用 "It just dawned on him/her/it" 或者 "It just occurred to him/her/it" 来表达。
举个例子：
It just dawned on me that I left my keys at the office. (我刚刚意识到我把钥匙留在了办公室。)
It just occurred to me that I haven't called my parents in a while. (我刚刚意识到我很久没有给父母打电话了。)
这个短语的来源可以追溯到中世纪拉丁文 "dawn"，意思是“黎明，开始”。"It just dawned on him" 可以解释为“突然想起，意识到”。"It just occurred to him" 则源于拉丁文 "occurrere"，意思是“发生，出现”。