月圆月缺；盈亏；兴衰成败

（月的）盈亏圆缺，<喻>盛衰

Dad and Dave───爸爸和戴夫

far and wide───adv.广泛地；到处

swang and bang───摇摆和砰砰

watch and ward───日夜守卫；时刻戒备

dead and gone───死了好久了

gave and take───平等交换；交换意见；互相迁就

tax allowance───收入总税额；免税额

Her feelings for John wax and wane.───她对约翰的感情时好时坏.

The wax and wane of the moon cause tides.───月亮的盈亏造成了潮汐.

The protracted episode illustrates how public health scares wax and wane.───这一迟到的插曲表明，公众对健康的担忧一时高涨，一时低落。

Why should the moon have wax and wane?───为什么一定会月有阴晴圆缺?

The [protracted] episode illustrates how public health scares wax and wane.───以及人，国家，教条，你将的，通过选择的类似行为的盈亏。