欧美国家地质填图历史悠久，地质填图一直被各国地调机构视为一项十分重要的工作。
There is a long history of geologic mapping in the Western countries, and geologic mapping is considered as a very impartment work by their geological survey bureaus.
与其他的转向车轴不同，半挂车在锁定装置被激活之前无需调直。
Unlike other steerable axles, the trailer does not have to be straight before the locking mechanism can be activated.
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