有人说，爱情难过七年之痒，有人说，浪漫只能持续两到三年，因为浪漫是化学物质。果真如此么？爱情当真没有保质期么？且看看这篇 USA Today的报告吧。 The honeymoon doesn't have to be over just because you've been together for years, new research suggests. ...