... directional focusing || 指向聚焦 directional freezing || 定向凝固，有向凝固 directional frequency response of microphone || 传声器指向性频率响应 ...
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... 倒向凝固 total reversal solidification 有向凝固 directional freezing 定向凝固的共晶体复合材料 in situ composite ...
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