词汇	regular octagon
释义	regular octagon 正八边形
随便看	under seal of confidence under seal of secrecy un-der seal of secrecy under seal of secrecy confidence undersea long-range missile system underseals underseal work underseam undersea manganese nodule belt Undersea Medical Society undersea military base undersea mineral deposit undersea mineral resources undersea mining Under-sea mining undersea mining technology undersea naval weapons center undersea nuclear plant undersea nuclear power plant undersea nuclear power station undersea oil production plant under-sea optical cable undersea optical cable monitoring undersea petroleum resources undersea pipeline