He looked fixedly at Nella and started back.他目不转睛地看着内拉,接着往后一缩.Nella stood at the end of the gangway.内拉站在舷梯尽头.At best Nella would be an invalid; at worst she would die.内拉往好里说会落下残疾，往坏处说可能会生命不保。At best Nella would be an inv...
砂岩和砾岩分别是砂和砾石固结的产物.Sandstone and conglomerate are the consolidated equivalent of sand and gravel.钻粉和岩心已穿过了砾岩夹层.Cuttings and core from the drill - holes have intersected conglomerate bands.在澳大利亚,尚未发现可开采的含铀砾岩.In Australia n...