In English, many past and present participles of verbs can be used as adjectives. Some of these examples may show the adjective use.
The movement of uranium away from thetest-firinglocation by tides and currents could not, therefore, be distinguished from natural background concentrations.
FromEuroparl Parallel Corpus - English
Based ontest-firingdata, some further optimisation of the systems is required.
From
Wikipedia
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