He was an expert in the field of Chinese history.
The farmer's field was a civil war battleground, and relics such a minnie bullets were frequently found while plowing.
Word: "field"
different meanings

The jar had a wide mouth.
They built a fire at the mouth of the cave.
Word: "mouth"
different meanings

The reason a steady state was never reached was that the back pressure built up too slowly.
Mankind should develop reason above all other virtues.
Word: "reason"
different meanings

Estimates for the losses in the earthquake range as high as $2 billion.
The instruments ranged from tuba to cymbals.
Word: "range"
the same meaning