He can no longer negotiate stairs, though his mind remains alert.

All bedrooms are on the first floor, so guests must be able to negotiate stairs.

But it is organized vertically rather than horizontally, which takes time to adapt to for many people not used to negotiating stairs.

People could evidently negotiate stairs, drive, even carry on a conversation while still asleep.

She could negotiate stairs with a broken ankle, but not the uneven trail or the cliffside.

There are, however, also elevators which stop on every floor for users unable or unwilling to negotiate stairs.

These wheeled devices introduce an additional limitation, however, since they cannot negotiate stairs.

They have been designed to be on a single level, so the older buyers will not have to negotiate stairs.

However, coordinating a large number of robot joints for even simple matters, like negotiating stairs, is difficult.

How does an underconfident dog learn to negotiate stairs?