对来自西沙群岛的双壳类鳞砗磲壳体沿着其生长纹取样并系统地作了锶同位素的分析，得出了该生物壳体的锶同位素生长变化曲线。
The authors collected systematic samples from the growth layers of Tridacna squasama in the Xisha Islands , determined Sr isotopic composition and obtained Sr isotopic growth curve of the mollusk .
鳞砗磲