常見(jiàn)例句雙語(yǔ)例句Researchers have found the ringed homocentric structures in the section of urinary stone, but the formation mechanism remains unclear.人們從尿結(jié)石的剖面圖上發(fā)現(xiàn)其具有環(huán)狀同心層結(jié)構(gòu)，但其形成原因尚不清楚。 返回 ring formation