vt. 1.扩大(范围等);使增加;扩张;使膨胀。 2.展开，张开。 3.扩充，使发展;【释】扩编。 4.【数学】展开。 5.详述，引伸，写出(缩体)。 expand one's knowledge 增长知识。 expand the business 扩展企业。 birds expanding its wings 展开双翼的飞鸟。 vi. 1.扩大，扩张。 2.伸展，张开，延伸；膨胀 (opp. contract)。 3.扩充；发展(into)。 4.详述，引伸(on; upon)。 5.变得和蔼，感到舒畅。 短语和例子 The saplings have expanded into trees. 苗木已长成树。 -er, -or n. 扩张器；扩管器；扩口器。
become larger in size or volume or quantity; "his business expanded rapidly"
exaggerate or make bigger; "The charges were inflated" 同义词：inflate, blow up, amplify,
grow vigorously; "The deer population in this town is thriving"; "business is booming" 同义词：boom, thrive, flourish,
expand the influence of; "The King extended his rule to the Eastern part of the continent" 同义词：extend,
make bigger or wider in size, volume, or quantity; "expand the house by adding another wing"
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing; "She elaborated on the main ideas in her dissertation" 同义词：elaborate, lucubrate, expatiate, exposit, enlarge, flesh out, expound, dilate,
extend in one or more directions; "The dough expands" 同义词：spread out,
例句与用法
1.
This factory expands to the riverside . 这个工厂的地界扩展到河边。
2.
The radius expands markedly at its lower end . 桡骨下端明显扩张。
3.
Its possibilities have vastly expanded . 大大提高了它的探测能力。
4.
Big money expands the choices . 只要万金在手，你就可以纵横驰骋。
5.
His face expanded in a smile of welcome . 他喜笑颜开地表示欢迎。
6.
The petals of the flowers expanded in the sunshine . 花瓣在阳光下张开了。
7.
They shouldn't have tried to expand overseas . 他们不应该力图向海外扩张。
8.
He breathed deeply and expanded his chest . 他边深呼吸边扩胸。
9.
The soil expands upon imbibing water . 土壤会由于吸水而膨胀。
10.
The cell walls must expand as the cells grow . 当细胞生长时细胞壁必然扩张。
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