There was a blackboard with seven names chalked on it.黑板上用粉笔写着7个人名。With a stick of chalk he wrote her order on a blackboard.他用一截粉笔将她的指示写在黑板上。I wrote the date at the far left of the blackboard.我把日期写在黑板的最左边。...
I turned around and wrote the title on the blackboard...我转过身，在黑板上写下了题目。I wrote the date at the far left of the blackboard.我把日期写在黑板的最左边。With a stick of chalk he wrote her order on a blackboard.他用一截粉笔将她的指示写在黑板上。The chalk j...
Since 1908, chlorine has been added to drinking water.自1908年以来氯就被添加进饮用水当中。Chlorine is used to disinfect water.氯用来给水消毒。Chlorine is added to kill bacteria.加氯是为了杀死细菌。...