- double cone
- double-cone
- 双锥: bipyramid
- 区: H region; H
- 双锥: bipyramid◇双锥离合器 double cone clutch; 双锥密 封 环 double-cone seal ring; 双锥体 bicone; 双锥天线 biconical antenna; 双锥选粒机 double-cone classifier
- 静锥区: cone of nulls; cone of silence; cone silence
- 不定性锥区: cone of ambiguity
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