海外的撒拉族研究工作虽然由来已久，然而进展缓慢。

Over the past century Salar research outside China has been making slow progresses.

youdao

海外的撒拉族研究工作虽然由来已久，然而进展缓慢。

Over the past century Salar research outside China has been making slow progresses.

youdao