The difference between the PFL and FFL is not obvious for large tensile stresses and so does the effect of the contact pressure on the FFL.是什么意思_The difference between the PFL and FFL is not obvious for large tensile stresses and so does the effect of the contact pressure on the FFL.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句