A trip down the memory lane: when you talk or think the past, 回首往事
An uphill battle: when you are having a difficult time in life, 迎难而上
Go with the flow: to be relaxed and easy- going in most situation. 随大流
Go against the flow: to be disgreeable, to do things that are the opposite of what most other people are doing, 各执己见
Water under the bridge: events in the past that are no longer important or a source of concern, 过眼烟云
We'll cross that bridge when we come to it: to not worry about something that's going to happen until it actually happens, 路到桥头自然直
A thorn in our side: a source of constant annoyance, 刺头
Nip it in the bud: to solve or eliminate a problem early when it is still small, 灭绝于萌芽状态
Beat around the bush: to avoid talking about the most important thing during a conversation, 拐弯抹角
Put down roots: to move somewhere permanently, 扎根
Good fences make good neighbours: barriers help people to respect one another's property, 亲疏有度，远近相安
The grass is always greener on the other side of the fence: other's people's lives might seem better but in realily may not me, 隔离饭香
On the fence: to be undecided something, 悬而未决
