generation n. 1.代〔約30年〕,世代,時代;同時代的人。 2.一代[一世]。 3.生殖,生育;發(fā)生,產(chǎn)生。 4.【數(shù)學(xué)】(面、體、線的)形成。 5.完善化階段,完善化方案,完善化的模型;發(fā)展階段。 a generation ago 約三十年前。 alternation of generations 【生物學(xué)】世代交替。 the present generation現(xiàn)代;現(xiàn)代人。 the last [past] generation上一代。 the first generation第一代 (the first generation university students 第一代大學(xué)生). future generations 后代。 the beat generation“垮掉的一代”〔美國青年中的頹廢派〕。 the rising [coming] generation下一代。 the younger [older] generation年輕[年老]的一代。 for generations 一連好幾代,祖祖輩輩。 generation after generation = from generation to generation 世世代代。
On the basis of detailed and systematic studies on the petrography , major and trace elements and sr - nd isotopic data of mesozoic volcanic rocks , especially the mafic volcanic rocks in yanshan area , we successfully studied the deep processes related to magma generation and their relationship with shallow - level tectonic evolution . the major conclusions are summarized as below . 1 論文通過對燕山地區(qū)中生代火山巖,特別是中基性火山巖,進(jìn)行詳細(xì)而系統(tǒng)的巖石學(xué)、主微量元素地球化學(xué)特征和sr - nd同位素組成特征的研究,主要取得了以下研究成果: 1燕山地區(qū)中生代( j - k )火山巖為一套鈣堿性-高鉀鈣堿性-橄欖安粗巖系列巖石。
The transitional group of diabases have intervenient sig , feg , tig , indicative of in - between melting degrees and melting depths . the highest nag in thes e rocks tend to suggest that na behaved as a moderately incompatible element during magma generation , thus preclude the possibility for residual jadeite to host na 所有的觀察事實反映徐州地區(qū)晚元古代輝綠巖來源于具有不同深度、不同富集程度的nd同位素虧損地幔,因此最好的解釋模式就是它們?yōu)榈蒯V鶝_擊作用下巖石圈-軟流圈-地幔柱相互作用的產(chǎn)物。