the romans made some good bridges of stones and many of these are still standing today,sometimes,since,no one could build a bridge across a river中since是什么意思?

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the romans made some good bridges of stones and many of these are still standing today,sometimes,since,no one could build a bridge across a river中since是什么意思?

the romans made some good bridges of stones and many of these are still standing today,sometimes,since,no one could build a bridge across a river中since是什么意思?
the romans made some good bridges of stones and many of these are still standing today,sometimes,
since,no one could build a bridge across a river中since是什么意思?

the romans made some good bridges of stones and many of these are still standing today,sometimes,since,no one could build a bridge across a river中since是什么意思?
至今,从那时以来