有一对23岁的双胞胎姐妹参加了我们的研究项目，她们的骨密度相当于一个77 岁老妇的骨密度。

They both had bone densities of a 77-year-old woman。

youdao

就我所知，杰克有一对孪生姐妹。

As far as I know, Jack's got twin sisters.

youdao

这一对孪生姐妹有一种乐天的性格。

The twin sisters have a happy disposition.

youdao

伊丽莎白热情地拥抱着她，姐妹两人都热泪滚滚。伊丽莎白一面又迫不及待地问她是否听到那一对私奔的男女有什么下落。

Elizabeth, as she affectionately embraced her, whilst tears filled the eyes of both, lost not a moment in asking whether any thing had been heard of the fugitives.

youdao

伊丽莎白热情地拥抱着她，姐妹两人都热泪滚滚。伊丽莎白一面又迫不及待地问她是否听到那一对私奔的男女有什么下落。

Elizabeth, as she affectionately embraced her, whilst tears filled the eyes of both, lost not a moment in asking whether any thing had been heard of the fugitives.

youdao