expansion
US /ɪkˈspæn.ʃən/
UK /ɪkˈspæn.ʃən/

1.
扩张, 膨胀, 扩大
the action of becoming larger or more extensive
:
•
The rapid expansion of the universe is a key concept in cosmology.
宇宙的快速膨胀是宇宙学中的一个关键概念。
•
The company announced a major expansion into new markets.
该公司宣布大规模拓展新市场。