1.perk up 額外津貼，附帶福利，外快；活躍起來

And the fed can abandon the commitment if growth or inflation perk up.
而且如果經濟增長或通貨膨脹活躍起來的話，美聯儲會放棄該承諾。

Consider installing a new sink-it's a relatively inexpensive renovation that will perk up your entire kitchen.
考慮一下換一個新的洗滌槽，這是一個相對花費不高卻能讓你整個廚房活躍起來的改造。

2.between and 在兩者之間

But arrangements were complicated by disagreements between and within the groups.
但是，因為這兩個組織內部和彼此之間的分歧，安排工作將會十分復雜。

The integration of information and communications technology in business has revolutionized relationships within organizations and those between and among organizations and individuals.
商業中的信息與通訊技術的整合改變了組織間以及組織與個人之間的關系。

3.tag along 尾隨

How about you let me tag along?
不如你就讓我跟著你去?

Tag along with us if you like.
如果你愿意,就跟著我們走吧。
4.according to 根據，按照；據…所說

Again this is according to recently declassified information.
這也還是根據最近解密的信息得知的。

It did not go according to plan.
這個妥協方案并沒有按計劃執行。