as plain as the nose on one's face (to be)
显而易见；明明白白
flash In the pan (to be a)
昙花 一现
go together (to)
谈恋爱
hit the nail [right] on the head (to)
完全正确；正中要害
love at first sight (to be)
一见钟情
pop the question (to)
求婚
pull someone's leg (to)
开某人的 玩笑；愚弄某人
rob the cradle (to)
与比自己年轻得多的异性约会
tie the knot (to)
结婚
walk arm In arm (to)
臂挽着臂走