无回声的 meaning in English

anechoic

Precision methods for the determination of sound power levels of noise sources in anechoic and hemi - anechoic rooms
在无回声和半无回声的室内精确测定噪声源声功率级的方法
Non infected seromas after surgery are usually anechoic collections . fluid collections complicated by infection or hemorrhage appear more complex , with ariable degrees of internal echoes , layering , and septa ( figure 2 )
术后未感染的血清肿常为无回声的积液，并发于感染或出血的积液其表现比较复杂，内部回声程度、分层和分隔常不同（图2 ）。
Non infected seromas after surgery are usually anechoic collections . fluid collections complicated by infection or hemorrhage appear more complex , with variable degrees of internal echoes , layering , and septa ( figure 2 )
术后未感染的血清肿常为无回声的积液，并发于感染或出血的积液其表现比较复杂，内部回声程度、分层和分隔常不同（图2 ）。