这个城市的快速扩张导致交通拥堵问题日益严重。

The rapid ___expansion of the city has led to increasing traffic congestion problems.

新图书馆是大学校园的一个重要扩建部分。

The new library is a major ___expansion of the university campus.

公司的国际扩张计划包括在五个新国家开设办事处。

The company's international ___expansion plan includes opening offices in five new countries.

这篇文章包含了对该理论更深入的扩展。

This article includes a detailed ___expansion of the theory.