... double-crystal diffractometer 双晶衍射计 double-crystal spectrometer 双晶分光计 double-directional focusing 双向聚焦 ...
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... 双晶衍射计 double-crystal spectrometer 双晶分光计 double-directional focusing 双放电稳定 double-doped laser ...
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focusing double-directional 双向聚焦
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