number of spindles

例句：

1. 1. The number of spindles is important for the quality of the yarn.
   纺锤的数量对纱线的质量很重要。
2. 2.The manufacturer has to count the number of spindles before starting production.
   制造商在开始生产前必须计算纺锤的数量。
3. 3.The number of spindles used in this machine is much smaller than that in other machines.
   这种机器使用的纺锤数量比其他机器少得多。