"co"As well as the magazine's "president" in English。这是你原话的翻译。主管:Competent。名词 person in charge 动词 be in charge of/be responsible for。主办:Host。动词 host。协办:Co。社长:Director。
radar is made on the basis that bat can identify object by searching ultrasonic wave. Radar is used widely in military affairs. It can ascertain object’s shape,