read between the lines的意思是弦外之音，比如：She's very indirect；with her，you have to always read between the lines.她說話很不直接，和她說話，你總是得猜測言外之意。
read between the lines這個用語始於19世紀中期，據說起源非常有趣且神秘，與間謀和暗語有關。間諜為了保護機密信息，通常會使用一種隱形墨水，將機密藏在書面的文字之間。後來這個說法被用來形容非書面的資訊，例如兩人間的對話內容。
看看老外聊天時怎麼用read between the lines:
Michelle:I wish I had something to do this weekend.
希望這個周末有事可做。
Brian：Well，you could always clean your house.
你總是有家務可做啊。
Michelle:Oh，Brian，can't you read between the lines？I want you to ask me out.
布萊恩，難道你不懂我的意思嗎？我是要你
約我出去。
Brian:Oh，sure.Where do you want to go？
喔，好啊。你想去哪裡？
例句精選：
Let the senior manager read between the lines; he or she probably knows already.
讓高級經理自己體會言外之意；他或她可能已經知道了。
There is, indeed, much to be read between the lines in this communication.
真的是，在這個信息的字裡行間有很多可以讀的東西。
While appreciating poetry, you must learn to read between the lines.
欣賞詩歌時，你得學著揣摩字裡行間的意思。
hey could read between the lines that she was a little homesick.
從字裡行間，他們可以看出她有點兒想家。