Definition: to increase in size or amount, or to make something increase in this way Level: B2
空气受热时会膨胀。
Air ___expands when it is heated.
该公司计划在今年扩大其市场份额。
The company plans to ___expand its market share this year.
广泛阅读有助于扩大你的词汇量。
Reading widely helps you ___expand your vocabulary.
