Both grooves could then be played at the same time using two needles.
这样两个沟槽可以同时演奏，通过使用两个针头。
Two row needles can work at same time, high speed and productivity.
双排针可同时工作，速度快，产量高。
There are two basic types of needles, latch and beard.
针的基本类型有两种：舌针和钩针。
There are two basic types of needles, latch and beard.
针的基本类型有两种：舌针和钩针。
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