Is it possible that an acoustic sensor which size is only 10 cm can form a narrow directivity with a constantbeam of 20 degree?是什么意思_Is it possible that an acoustic sensor which size is only 10 cm can form a narrow directivity with a constantbeam of 20 degree?在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句