“轴线”怎么读

一轴线a spool of thread圆的轴线是其直径.The axis of a circle is its diameter.我在这个店里买了三轴线.I bought three spools of thread at the store....

“轴线”的英语可以翻译为：[机] axis，axle，[纺] spool thread，spool cotton，axes ...