★ expand ：to become larger in size, number, or amount, or to make something become larger
① (使)扩大；增加 同义词：increase
The computer industry has expanded greatly over the last decade.
计算机行业在过去十年间大大地发展起来。
expand knowledge of foreign countries
增加对外国的了解
② v. 扩展;扩大;(使)膨胀:
expand domestic demand 扩大内需
When you heat a metal， it expands金属遇热膨胀。
Water expands as it freezes.
水结冰时会膨胀。
▲ 派生词：
expansion n.扩大，扩张，扩充
The rapid expansion of cities can cause social and economic problems.
城市规模的迅速扩大会带来各种社会和经济问题。
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