Making the house habitable was a major undertaking.

把这房子收拾得可以住人是个大工程。

《柯林斯英汉双解大词典》

It's a major undertaking, but it's worth it.

这是项主要任务，不过这么做值得。

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Ten years ago, an electronic commerce project was a major undertaking.

十年之前，一个电子商务项目就是一项重点任务。

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S. The State of the Union Address is a major undertaking here at the White House.

WHITEHOUSE: Our Top Stories

For each major undertaking Muybridge invented the appropriate kind of photography to suit.

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Changing a logo is a major undertaking and risk for a brand.

FORBES: Starbucks, HTML5, The Gap And More Lessons On New Logos