This vast archive has been indexed and made accessible to researchers.这个存量巨大的档案室的所有文件都已编了索引，可供研究人员使用。She went to the city archive this morning.她今天上午去了市档案馆。In fact, it presupposes an excellent legal archive or law library...
The car slid down the steep gradient into the river.汽车滑下陡峭的斜坡掉入河中.This indicates a hydrodynamic condition with a very marked potentiometric gradient.这说明水动力条件具有很明显的位能梯度.4 gradient arrays marked A, B, C and D were set up.布...