by and by是什么意思

By and by electricity will take the place of coal.不久以后,电将取代煤.Summer vacation will come by and by.暑假很快就要来到.He'll come round by and by.他会慢慢想通的....

by and by的音标：by and by的英式发音音标为：[bai ænd bai]by and by的美式发音音标为：[baɪ ənd baɪ]...