pebble-bed mechanics是什么意思，pebble-bed mechanics的翻译，pebble-bed mechanics音标、读音、用法和例句_開心英語字典

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pebble-bed mechanics是什么意思，pebble-bed mechanics的翻译，pebble-bed mechanics音标、读音、用法和例句_開心英語字典_柠咚词