As I gradually master my buoyancy and hover 15 feet below the surface, I can see schools of small yellow groupers beneath the dive boat giving wide berth to a blade of a barracuda.
当我逐渐适应了浮力，盘旋下潜到水面以下15英尺以后，就看见成群结队的黄色小石斑鱼为了躲避梭鱼而藏在潜水船下方。
Based on ultrasonic measuring distance technology, a new method of detecting obstacle and giving a wide berth used in electric wheelchairs is presented.
根据超声波测距原理，提出一种基于超声测距技术的电动轮椅车检测障碍物、避障的新方法。
应用推荐