大业的英文：
great cause
great undertaking

参考例句：

To have attained the great business
大业告成

The great undertaking of founding a state
立国大业

Great virtues and magnificent achievements
盛德大业

He studied hard for 30 years and succeeded at last.
他苦读了三十寒暑,后终成大业。

As long as we remain subject to an alien power, too much of our energy is diverted from constructive enterprise.
只要我们仍然受到外国统治，我们就会有太多的精力不能用在建设大业上。

great是什么意思：
adj. 巨大的；很多的；重大的；伟大的；优异的；极好的；非常的
n. 大师；大人物，伟人

A great talker is a great liar
言多必妄

Great hopes make great man
伟大的抱负造就伟大的人物

Great hopes make great men
伟大的希望造就伟大的人物

cause是什么意思：
n. 原因；理由；事业，目标
v. 引起；使遭受；促使

There is no cause for concern.
不必担心。

To cause to zoom.
使急遽上升，使猛增

To cause to taper.
使成锥形

undertaking是什么意思：
n. 事业，企业；保证
v. undertake的现在分词

to bear; to shoulder; to undertake; to assume
担负

A chivalrous or adventurous undertaking.
大胆的或冒险的经历

Their installation proved a laborious undertaking.
要来安顿这些人，确实是一件麻烦的事情。