例句與造句

1. Following a downward left hand helix, the train makes a final banked right turn into the final brake run leading back to the station.
2. Spring washers are a left hand helix and allow the thread to be tightened in a right hand direction only, i . e . a clockwise direction.
3. It's difficult to find left hand helix in a sentence. 用left hand helix造句挺難的