Robot explored uncharted territory.
Meaning: This sentence describes a robot traveling through an unknown area of land.
Choice of Words: Robot is a machine that can do work automatically. Explored means to travel through an area in order to learn about it. Uncharted means not shown on a map or not known about. Territory is an area of land under the control of a particular government or ruler. When you put them together, it means a machine that can do work automatically traveled through an area of land under the control of a particular government or ruler that is not shown on a map or not known about.
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