办公室的饮水冷却器the office water cooler直接蒸发式空气冷却器是利用原有的湿表面工作的.The direct type of evaporative air cooler uses primary wet surfaces.这就是当时人们所熟悉的蒸发式冷却器.It is then known as an evaporative cooler....
They will be helped by the very latest in navigation aids.他们将会受益于最新的导航系统。Pack ice around Iceland was becoming a threat to navigation.冰岛周围的浮冰群曾一度对船只航行构成威胁。a laser navigation device激光导航装置...