两种情形看起来有些相似，但实质却有很大区别——这种情况我们在日常生活中偶尔会遇到。用英语应该如何表达?

　　1. There's a fine line between drinking socially and alcoholism.

　　喝酒应酬和嗜酒可是有区别的。

　　2. There's a fine line between helping your kids with their homework and doing it for them.

　　帮孩子做作业和替孩子做作业可是有区别的。

　　3. There's a fine line between dressing a little sexy and looking trashy.

　　穿着性感和穿得很low可是有区别的。

　　4. There's a thin line between courage and foolishness.

　　勇敢和鲁莽可是有区别的。

　　总结

　　如果说A与B之间有个fine line，那么就表示：虽然A与B很相像，但其实有很大区别，而且通常情况下，A比B要好。这里的fine line也可以说成thin line。不过，“A好B坏”这种分法也不是绝对的。比如下面这两个例子：

　　As a ​parent, I ​knew that there was a fine ​line between ​panic and ​caution.

　　作为一位家长，我知道吓唬孩子和提醒他们还是有区别的。

　　It's a fine line between being a backseat driver and a considerate passenger.

　　坐在后座的情况下，指手画脚和好心提醒还是有区别的。