The wall thickness of the profile should be well-proportioned, the quantity of the single arm should be controlled, the cross of the section should be avoided, and the shape of the sect...是什么意思_The wall thickness of the profile should be well-proportioned, the quantity of the single arm should be controlled, the cross of the section should be avoided, and the shape of the sect...在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句