To keep your bearings in a desert sandstorm is impossible.在沙漠的尘暴中要想保持方位感是不可能的.With the aid of a compass the traveler can find his bearings.藉助罗盘,旅行者可以找到自己所处的方位.A sightseeing tour of the city is included to help you get yo...
The three basic types of antifriction bearings are ball bearings, roller bearings, needle bearings.减摩轴承基本上有滚珠轴承 、 滚柱轴承和滚针轴承三种.A sightseeing tour of the city is included to help you get your bearings...市区观光游也包含在内，帮助你熟悉一下这...