In 1950 followed a special type of crane with a boom designed for working below overhead wires.

1950年，出现了一种特殊的带有悬臂设计的起重机，用于在高架电线下工作。

youdao

In 1950 followed a special type of crane with a boom designed for working below overhead wires.

1950年，出现了一种特殊的带有悬臂设计的起重机，用于在高架电线下工作。

youdao