Think of something as seemingly benign as the cellphone: we have microfinance and text-based social networking at one end of the spectrum, and improvised explosive devices at the other.
2019年6月六级真题（第三套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
VERB
临时做;临时凑成
If you improvise, you make or do something using whatever you have or without having planned it in advance.