Warning: file_put_contents(/www/wwwroot/ppbbbu/n94.cn/cache/aaf301abefabae937677e99fc0be4cb1.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbbu/n94.cn/index.php on line 55 etalon英英字典_etalon剑桥英语解释_etalon柯林斯英文解释_94生活常识网有道词典
1. N a device used in spectroscopy to measure wavelengths by interference effects produced by multiple reflections between parallel half-silvered glass or quartz plates 标准具[physics]