第三的英語翻譯：

third; thirdly
【機】 third

磨牙的英語翻譯：

grind one's teeth; indulge in idle talk; molar
【醫(yī)】 axle-tooth; azzle-tooth; azzlz teeth; back teeth; brymus
dentes columellaris; dentes molares; grinder; jaw teeth
masticatory teeth; molar; molar teeth; mylodontes; mylodus
odontoprisis; triturating teeth; wall teeth