In 2002 Klass told a reporter that "radar technology in 1952 wasn't sophisticated enough to filter out many ordinary objects, such as flocks of birds, weather balloons, or temperature inversions."
在2002年克拉斯告诉一位记者“1952年的雷达技术还不够先进，无法滤过一些普通物体，例如鸟群，气象气球或者逆温。