A woman came out of her house and saw 3 old men with long white beards sitting in her front yard. She did not recognize them.
这个女人发现在她家前门外坐着三个白胡子老头，她并不认识他们。
SAW 3-phase unidirectional transducers offering advantages of. low loss and wide bandwidth (30%) have great difficulty in adjustment.
三相单向换能器具有损耗小，带宽大(30%)等优点，但是这种换能器的调整较困难。
SAW 3-phase unidirectional transducers offering advantages of. low loss and wide bandwidth (30%) have great difficulty in adjustment.
三相单向换能器具有损耗小，带宽大(30%)等优点，但是这种换能器的调整较困难。
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