It is unclear who prepared these early medallions, only that each individual box containing a medallion bore the word "Fliteline".句中的only that 应该如何理解?这是一个组合连词吗?希望解答,谢谢。
Opera artists began using layers of masks made of oiled paper. They could peel one after another in the blink of an eye.这里的one after another是指layer还是mask呢?
As time goes by,the society has witnessed more people and experienced a booming industry as well as more prosperous economy.这句话的句子结构看不懂,意思也翻译不出来,麻烦拜托老师把句子结构及意思讲解下好吗?谢谢老师!