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Use "tracers" in a sentence
"As Maltby disappeared from my view he appeared to be completely enveloped in tracers from the enfolding fire and it seemed impossible that he could survive."
"Then little dots of light start winking back, and green tracers from the AK-47s begin to weave ill with the red to form brilliant patterns that seem, given their great speeds, oddly timeless, as if they had been etched on the night."
"He looked back and could see two streams of tracers from a 37-millimeter enemy anti-aircraft gun, a twin mount, nearly dead astern from him."