keen-sighted


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Though this may be alright (sic) from a sanitary point of view, I think the practice should be discontinued as it is possible they might attract the attention of keen-sighted enemy airmen.
This is because the keen-sighted can usually make out six or seven stars with the naked eye.
With the keen-sighted instruments available today, however, the dust trails are coming into sharper focus, opening the way to finding and characterizing the properties of hundreds of planets beyond the solar system.
They had little to say about the environment, even though keen-sighted visionaries like Dr.