n. 弓状结构,拱

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downtank,
down-the-hole,
downthrow,
downthrust,
downtick,
down-tilter,
downtime,
down-to-earth,
Downtonian,
down-to-time,
相似单词
archimonerula,
Archimycetes,
archine,
archinephridium,
archineuron,
arching,
archipallium,
archipelagic,
archipelago,
Archipenko,