这是一项有关超感官知觉的试验。
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。
When the experiment was done, basic investigations were done on security of using B-mode ultrasound.
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