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How do you say "working in a company" in Korean?

L 1: working in a company

Korean:?

Roman phonetic alphabet: Hoe Sa E Seo Il Ha Da

For example:

1. I work in a trading company.

.

I have worked in a private enterprise. :?

. →

During the day, he works for American Standard Company downtown.

? ? ? .

I work in the marketing department of the company.

Answer? .

He works in a private security company.

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