They have guaranteed delivery within three days.

他们保证三天内交货。

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They have guaranteed delivery within three days.

他们保证三天之内交货。

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Guaranteed delivery with optional acknowledgements.

带有可选回执有保证的运送。

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Amazon avoids much of that with guaranteed delivery to its lockers, often housed in locations operating 24 hours a day.

WSJ: Amazon's New Secret Weapon: Delivery Lockers

If ordered by December 3, the glove is guaranteed delivery by Christmas.

FORBES: Louisville Slugger Has A Gem With New myEvolution Custom Glove

The average size of parcels sent from business to business is also growing, as global firms increasingly depend on speedy supply, and guaranteed delivery times, of parts and supplies.

ECONOMIST: Global express-package companies