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Thesecoinswereusedforthenext2000years,thatis,from221BCuntil1916.这里的句子成分看不懂thesecoinswereused就是主谓了而thatis不是重到了吗?说是同位语又奇怪,而且thatis又被两个逗号隔开

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These coins were used for the next 2000 years,that is,from 221 BC until 1916.这里的句子成分看不懂
these coins were used 就是主谓了 而that is 不是重到了吗?说是同位语又奇怪,而且that is又被两个逗号隔开
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that is 作插入语,不影响句子成分.表示进一步说明,可译为“即”.
常用的插入语有 I think I guess that is say
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