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。
traditional current velocity instrument怎么读 traditional current velocity instrument是什么意思
