big business

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These concerns have made the care of cats into big business.
這種關心使得對貓的照顧成爲一項大生意。
Moreover, while all this is happening, immigrants are allegedly streaming into the US, partly at the behest of big business, to keep the labour market weak.
此外，盡琯這一切都在進行，但移民們聲稱，他們湧入美國部分是因爲大財團一直希望勞動力市場保持虛弱。
Or might there be another explanation for why we find such a marked shortage of women, not just in the highest levels of science but in big business, the professions, and politics, too?
關於爲什麽我們發現不僅在科學界的高層女性特別少，大企業、專業領域還有政界也不例外，這可能還有其他的解釋嗎？

My mother was a teacher. My father had planned to become a big business man, but he became a social worker instead.
Now Microsoft is sort of a funny place, we've got these big businesses but in the software business big businesses need to be constantly recreated.
現今的微軟是非常有意思的地方，我們運行著龐大的生意，但是在軟件交易上,大宗交易更像是消遣。
斯坦福公開課 - 微軟CEO-Steve.Ballmer談科技的未來課程節選
you know. So, it's a big business.
你知道。所以，這是件大事。
帕麗斯·希爾頓 - SpeakingMax英語口語達人

Consumers seemed to think that the weather would translate into big business for Big Box retailers.
FORBES: Hurricane Irene Beats Up The Northeast And The Fragile U.S. Economy

(BUSINESS) powerful and influential businesses and financial organizations (= ones with a lot of influence) when considered as a group
(POPULAR) something that makes a lot of money

Big business is business which involves very large companies and very large sums of money.
Something that is big business is something which people spend a lot of money on, and which has become an important commercial activity.