thread root diameter
美
[θrɛd rut daɪˈæmɪtɚ]
英
[θred ru:t daiˈæmitə]
螺纹内径
Examples
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美[θrɛd rut daɪˈæmɪtɚ]英[θred ru:t daiˈæmitə]
螺纹内径