Definition: a number of similar things Level: C2
记者向政治家提出了一连串问题。
The journalist fired ___a ___string ___of questions at the politician.
该公司今年取得了一系列成功的产品发布。
The company has had ___a ___string ___of successful product launches this year.
快速城市化导致了一系列社会和环境问题。
The rapid urbanisation led to ___a ___string ___of social and environmental issues.
