On B - mode ultrasound, and inhomogeneous hypo-echoic mass was seen.
超示肿块为不均匀的低回声区。
When the experiment was done, basic investigations were done on security of using B-mode ultrasound.
在试验进行的同时，对B超使用的安全性做了基本调查。
When the experiment was done, basic investigations were done on security of using B-mode ultrasound.
在试验进行的同时，对B超使用的安全性做了基本调查。
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