elliptical type weight

• 椭圆形测深重锤,铅鱼

elliptical type weight的用法和样例：

例句

1. From its application, rotation times of streamlined weight become lower, failures of current meters also decrease, thus greatly improving life time of hydrometric cableway.
   从使用情况看，铅鱼的旋转频率降低了，流速仪的损坏减少了，从而有效提高缆道的使用寿命。