怀恋的英文：
to think fondly of (past times, old friends, etc.); to look back nostalgically

参考例句：

I think fondly of my childhood.
我十分怀恋我的童年。

think是什么意思：
v. 认为；想；琢磨；试想；预期；一心想；计划；记得

I think and think and cannot cease from thinking.
我想了又想，一直想个没完。

Think of solar power, and you probably think of photovoltaic panels.
当考虑到太阳能，你一定会想到光伏电池板。

Do you think it will rain? -- Yes, I think so.
你看会下雨吗？是的，我想会下雨。

fondly是什么意思：
ad. 溺爱地,怜爱地,轻柔地

To treat fondly,kindly,or favorably;cherish.
珍爱深情、友善或宠爱地对待;珍爱

But indeed I would love you fondly and truly.
但是真的，我会亲切地，真诚地爱你。

Over the years I fondly thought of him as my
在过去的那段日子里，我竟天真地把他看作是我的“瓦伦丁节的情人”。

past是什么意思：
n. 过去；往事
adj. 以前的；结束了的；过去式的
adv. 以前地；经过，超过
prep. 在…之后，晚于；再也无法；经过，越过；超过

The past is the prologue.
前事不忘，后事之师。

He pasted the wall with Burlap. The wall is pasted with splotches.
他用粗麻布贴墙。墙上沾满了污点

It happened far back in the past.
这事发生在久远的过去。