Thread grinder
[機] 螺紋研磨機
?? 詞語組成解析
thread
[θr?d]
n. 線;線索;線狀物;螺紋;
vt. 穿成串;將（針、線等）穿過…;用…線縫;給…裝入（膠片、狹帶、繩子）;
grinder
[['graind?]]
n. 推磨的人, 研磨者\\n[化] 磨床; 磨木機; 研磨機
??? 情景例句
No, it's an original. My father's friend is a calligrapher, and I had him make it for you.
沒錯，這可是真跡。我父親的朋友是書法家，專門幫你寫的。
I was listening to the radio.
我正在聽收音機。
About once a month. Not too often, because neither of us has much time. We both have too much work to do.
大約每月一次。不太經常寫信，因為我倆的時間都很緊。我們都有做不完的事。