Neutron fluence measurement - part 2 : fast - neutron fluence determination with iron activation detectors 中子注量测量.第2部分:用铁活化探测器测定快中子注量
2.
Certain it is that , some fifteen or twenty years after the settlement of the town , the wooden jail was already marked with weather - stains and other indications of age , which gave a yet darker aspect to its beetle - browed and gloomy front . the rust on the ponderous iron - work of its oaken door looked more antique than any thing else in the new world 可以确定无疑地说，早在镇子建立十五年或二十年之际，那座木造监狱就已经因风吹日晒雨淋和岁月的流逝而为它那狰狞和阴森的门面增加了几分晦暗凄楚的景象，使它那橡木大门上沉重的铁活的斑斑锈痕显得比新大陆的任何陈迹都益发古老。
