Warning: file_put_contents(/www/wwwroot/ppbbu/www.30232.com/cache/f2443a73b251ef239025f6f5fab66384.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/www.30232.com/index.php on line 55 focal-ratio degradation是什么意思，focal-ratio degradation的翻译，focal-ratio degradation音标、读音、用法和例句_绍翊字体网有道词典
Aiming at the application of the telescope, the main performance of the fiber are the spectral-transmission efficiency and the focal-ratio degradation. 针对此望远镜的应用，对光纤的要求主要集中在对星光的传输性能和焦比蜕化性能上。