used to show up at your door

过去在凌晨三四点

show up显而易见； 到场； （使）看得见； 羞辱

例句：

Scientists know that cancer may not show up for many years.

科学家们知道癌症可能会潜伏多年。

They rushed the burial through so no evidence would show up.

他们仓促举行了葬礼，掩盖了所有证据。

Hang the picture somewhere where it will show up to advantage.

把这幅画挂在便于它显示较好效果的地方.

and you wouldn't look back for me

你却不曾为我流连一眼

look back v.回顾； 倒退； 追忆； 回头一看

例句：

I will look back at this one with undiluted pleasure.

回顾此事，我会无比地开心。

They can look back on their endeavours with pride.

他们可以骄傲地回首过去付出的努力。

Many people look back with nostalgia to feudal times.

许多人留恋不舍地回顾封建时代.

of you coming through

只为听到你经过之声

Come through到达； 穿过； 传来； （健康）恢复

例句：

The city had faced racial crisis and come through it.

该市曾面临种族危机，不过已经安然渡过。

He's too old to come through a fall like that.

他年纪太大，经不起那么摔一跤。

The country had come through the worst of the recession.

该国已经度过了经济衰退最糟糕的时期。