牙距英语怎么说?
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牙距英语怎么说?牙距英语怎么说?牙距英语怎么说?pitchofthread,helicalpitchpitchpitchtoothpitchdiastema:gap/spacebetweentwote
牙距英语怎么说?
牙距英语怎么说?
牙距英语怎么说?
pitch of thread,helical pitch
pitch pitch
tooth pitch
diastema : gap/space between two teeth.牙间隙