subsonic speed短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 亚音速 I have no idea what subsonic speed is. 我实在不明白什么是亚声速。 nciku The B152 nicknames are“ with overflow the level fortress”, is one kind of subsonic speed long- distance strategic bomber which develops by the US. 一52绰号为“同溢层堡垒”，是由美国研制的一种亚音速远程战略轰炸机。 qdcs5