動詞 expand:

1. extend in one or more directions
   同義詞：spread out
2. become larger in size or volume or quantity
3. make bigger or wider in size, volume, or quantity
4. grow stronger
   同義詞：boom, prosper, thrive, get ahead, flourish
5. exaggerate or make bigger
   同義詞：inflate, blow up, amplify
6. add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
   同義詞：elaborate, lucubrate, expatiate, exposit, enlarge, flesh out, expound, dilate
7. expand the influence of
   同義詞：extend

1. Metals expand when they are heated.
   金屬遇熱則膨脹。
2. Our foreign trade has expanded during recent years.
   近年來我們的對外貿(mào)易有所擴大。
3. The petals of many flowers expand in the sunshine.
   許多花的花瓣在陽光中綻放。

ex.pand

v.（動詞）
ex.pand.ed,ex.pand.ing,ex.pands
v.tr.（及物動詞）
To increase the size, volume, quantity, or scope of; enlarge:
擴大：增加尺寸、體積、數(shù)量或范圍；擴大：
例句：
expanded her store by adding a second room.See Synonyms at increase
加一間房屋來擴大她的商店參見 increase

To express at length or in detail; enlarge on:
詳述：更充分地闡述；詳述：
例句：
expanded his remarks afterward.
在后面詳細闡述他的評論

To open (something) up or out; spread out:
張開；展開：
例句：
The bird expanded its wings and flew off.
鳥展開翅膀飛走了

Mathematics To write (a quantity) as a sum of terms in an extended form.
【數(shù)學】 展開：以延展的形式記下（數(shù)量）某項數(shù)
v.intr.（不及物動詞）
To become greater in size, volume, quantity, or scope:
展開：在尺寸、體積或范圍等方面變大：
例句：
Air expands when heated. This critic`s influence is expanding.
空氣受熱膨脹；批評的影響正在擴大

To speak or write at length or in detail:
詳述，充分敘述：
例句：
expand on a favorite topic.
詳述一個感興趣的論題

To open up or out; unfold:
張開；展開：
例句：
The chair expands to form a day bed.
椅子展開形成一張睡椅

To feel expansive.
心情舒暢

來源：
Middle English expanden [to spread out]
中古英語 expanden [展開]
from Latin expandere
源自 拉丁語 expandere
ex- [ex-]
ex- [前綴，表.出自….]
pandere [to spread] * see pet…-
pandere [展開] *參見 pet…-

【引伸】
expand.able
adj.（形容詞）
expand.er
n.（名詞）