Warning: file_put_contents(/www/wwwroot/ppbbu/laei.cn/cache/6418d6558b236c1bc107e6467db25830.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/laei.cn/index.php on line 58 limiting signal velocity是什么意思，limiting signal velocity的翻译，limiting signal velocity音标、读音、用法和例句_按摩法牛津词典