X字开头的单词或词组
x-ray dosexylidinexerosisx2 testxaserxanthippexeroticxylometazolinexylazinexenogenicxerotesxeranthemumxanthenonex bodiesxenylXanthomonasxylocinnamomumxanthiuriaX/OpenxanthinuriaX Windowx-elementX-radiationX-ray diffractionxylitexiphidinx diseasex-legX-particlexylenol-salolxenatexylylene aminexerodermiaxanthosisxanthocyanopsiaxanthophylxanthosinexoanonxantheinxanthochromicxylographx-rays tube