1. The steam turbine is less economical at cruising speed. 汽轮机在巡航速度下经济性较差。
2. The cruising speed of this new type of fighter is Mach two. 这种新型战斗机的巡航速度为声速的两倍。
3. If the Burrow is in Devon, that implies a cruising speed of 900 m. p. h. —so the sonic boom would make them highly conspicuous even if they were invisible! 如果陋居在德文郡,那意味着900英里每小时的巡航速度——因此即使他们是看不见的,音爆会使他们非常显著!