minimum detectable echo level

例句：

1. 1. The minimum detectableecho level for this device is 20 decibels.
   该设备的最小可检测回声水平为20分贝。
2. 2.The researchers found that the minimum detectableecho level was too high for the detectionof small objects.
   研究人员发现，对于小物体的检测，最小可检测回声水平太高了。
3. 3. The manufacturer claims thattheir product has a minimum detectableecho level of 50 decibels.
   制造商声称他们的产品具有50分贝的最小可检测回声水平。