Warning: file_put_contents(/www/wwwroot/ppbbu/28094.com/cache/e393dfdaf2a53457d6157c62994f00a6.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/28094.com/index.php on line 55 ring formation例句_ring formation英汉例句_ring formation双解例句_贰靶汉英词典
Researchers have found the ringed homocentric structures in the section of urinary stone, but the formation mechanism remains unclear. 人们从尿结石的剖面图上发现其具有环状同心层结构，但其形成原因尚不清楚。