Could teachers advise me on why an indefinite article instead of the definite article is used here? Thank you.
"On October 1st China offered a stunning display of the hard edge of its rising power as it paraded its fast-growing military arsenal through Beijing." -Economist.
Many other displays can be imagined. This is just one of a million possible displays to mention. We would use the definite article if the display was perceived to be unique, necessarily. The expectation is that it is not.