| 41. | Anti-aircraft fire and tracers lit up the Beirut night sky.
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| 42. | The tracer gas is helping scientists measure swirling air motions.
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| 43. | Tracer bullets pierced the night sky above the village, police said.
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| 44. | Tracer fire arced through the skies, and loud explosions rang out.
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| 45. | Tracer rounds raced through the sky and shells exploded in the air.
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| 46. | The tracer was visible against a bright, azure northwest China sky.
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| 47. | Iodine-131 is also used as a radioactive tracer.
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| 48. | Carbon-14 can be used as a radioactive tracer in medicine.
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| 49. | The British also fitted tracers to their shells for use at night.
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| 50. | She wakes up in her Tracer orbiting an extrasolar planet.
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