英语翻译There are still concrete structures today that were made by the Romans.Modern cement was developed in the 18th century.Combining the proportioned amounts of lime,iron,silica,and alumina,and burning them in a rotating oven or kiln (Fig.6.4

there are still 还是 there still are are u still there,my are u still there,my dear Are you still there?是啥意思 Are you available Still be there There are still twenty minutes left. there are still errors on drive 英语翻译Even now there is still hope 英语翻译There are some( ) ( ). still there? 英语翻译If there is anyone out there who still doubts America is a place where all things are possible中的out theres怎么翻译呀? there are still some people ( suffering )from poverty there are still 后面是填breads还是hamburgers 英语翻译there are some fruit trees there . 英语翻译there you are at 英语翻译There is still some time to go. 英语翻译There is still ( ) ( ) ( ) to go to save the panda. 英语翻译Over 1,000,000 people a day use the London underground,but there are still too many cars on the streets.