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。
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!