1.period 周期

Use of computers spread rapidly during that period.
在那个时期，计算机的应用迅速流传开来|ovcT-SFi.|kV[w。

2.inflation 膨胀

Inflation is a constant threat.
通货膨胀是一种持续的威胁22#i9yyhj&IH*。

3.shrink 缩小

He shrank back against the wall as he heard them approaching.
听见他们朝这边来，他退到墙根6%&A;GuQ3NP,(q)。

4.recession 衰退

The economy is precariously close to recession.
经济濒于衰退的边缘R[mA9v)HN9tc。