vt.

1. 展开，张开（帆，翅等）
   The eagle expanded its wings.

   老鹰展开翅膀。

2. 使膨胀；使扩张
3. 扩大；扩充；发展
   He is thinking of expanding his business.

   他正考虑扩展他的生意。

4. 详述
   They have expanded my view on the question.

   他们已更充分地阐明了我对这个问题的观点。

vi.

1. 展开，张开
2. 扩张；发展；增长
   In ten years the city's population expanded by 12%.

   十年之中，该城人口增加了百分之十二。

3. 膨胀
   Water expands when it freezes.

   水结冰时体积膨胀。

   A tire expands when you pump air into it.

   轮胎打了气就会胀大。

4. 详细说明[（+on/upon）]
5. 变得和蔼可亲；感到心旷神怡；变开朗
   My father expanded a little when he had had a drink, and started to talk more freely.

   我父亲小酌之后，就变得开朗可亲些，话也说得多了。

   Her face expanded in a smile.

   她笑逐颜开。

v.

1. make or become larger or more extensive.
2. (expand on) give more details about.
3. become less reserved.