Keys can be programmed to open multiple doors, so if all of the places your visit use the CyberLock system, you could feasibly carry one key.
In this environment — especially given the expectation of career changes — the most useful degrees are those that can open multiple doors, and those that prepare one to learn rather than do some specific thing.
Going on a date with one person will open multiple doors.
Tolerance and receptiveness to others open multiple doors throughout life.
Otherwise, any mistreatment will open for you multiple doors of evil for which you can only blame yourselves.
We have multiple doors open now.
I let strangers hold multiple doors open in a row when I'm managing the double stroller, instead of saying, "Oh, it's fine, I've got it," while earning painful bruises trying to do it on my own.
Open doors, open doors, one after another.
Some of the larger palaces had several stairways giving access to the antechamber, and multiple doors and pillars opening into the rooms of main building.
Subscriptions to these websites opened the doors for multiple companies and organizations (not only pharmaceuticals) to send information about diseases/conditions, and to promote drugs, diet products, medical procedures, etc.
