adj. made by people, often as a copy of something natural Artificial limbs are fake arms and legs.
respond
v. to do or say something as a reaction to something else that has happened
Some electronic artificial hands respond to movements in the muscles.
rotating
adj. moving around a point in the center
Artificial legs have rotating knees that bend and extend.
extend
v. to make something longer
Artificial legs have rotating knees that bend and extend.
stairs
n. a series of steps that go from one level or floor to another
They allow users more exact movements, such as climbing stairs and riding bikes.
control
v. to have power over something
These days, scientists are inventing artificial limbs that are controlled by thoughts.
allow
v. to give permission for someone to do something
These chips allow users to use their brains to move their artificial limbs.
limb
n. an arm or leg
Artificial limbs are fake arms and legs.
fake
adj. not real, but made to look or seem real
Artificial limbs are fake arms and legs.
performance
n. how well a person, team, or machine carries out a task
Over the years, the design and performance of artificial limbs have improved a lot.
ugly
adj. unpleasant to look at
In the past, artificial limbs were heavy and ugly.
offer
v. to provide or supply something
Back then, artificial limbs offered very little convenience for those in need of them.
convenience
n. a quality or situation that makes something easy or more comfortable
Back then, artificial limbs offered very little convenience for those in need of them.
bend
v. to curve or flex something
They didn’t bend or move easily.
natural
adj. not involving anything made or done by people
Compared to these, artificial limbs today are more like natural limbs.
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