1.perk up 额外津贴，附带福利，外快；活跃起来

And the fed can abandon the commitment if growth or inflation perk up.
而且如果经济增长或通货膨胀活跃起来的话，美联储会放弃该承诺。

Consider installing a new sink-it's a relatively inexpensive renovation that will perk up your entire kitchen.
考虑一下换一个新的洗涤槽，这是一个相对花费不高却能让你整个厨房活跃起来的改造。

2.between and 在两者之间

But arrangements were complicated by disagreements between and within the groups.
但是，因为这两个组织内部和彼此之间的分歧，安排工作将会十分复杂。

The integration of information and communications technology in business has revolutionized relationships within organizations and those between and among organizations and individuals.
商业中的信息与通讯技术的整合改变了组织间以及组织与个人之间的关系。

3.tag along 尾随

How about you let me tag along?
不如你就让我跟着你去?

Tag along with us if you like.
如果你愿意,就跟着我们走吧。
4.according to 根据，按照；据…所说

Again this is according to recently declassified information.
这也还是根据最近解密的信息得知的。

It did not go according to plan.
这个妥协方案并没有按计划执行。