She retained a number of copies for further annotation.她保留了许多副本以便作进一步的注解。This type of annotation may be extremely useful for bibliographies and booklists.这种形式的“注释”对书目和目录极为有用.Annotations: Select and order the annotation f...
自1908年以来氯就被添加进饮用水当中。Since 1908, chlorine has been added to drinking water.氯用来给水消毒。Chlorine is used to disinfect water.加氯是为了杀死细菌。Chlorine is added to kill bacteria....