The path of main crane is planned according the heuristic information beforehand, the movement of following crane is planned according the movement of the main crane and the load.

主起重机的期望轨迹在一定启发式信息的引导下预先规划，从起重机轨迹则根据运动约束关系计算出来，它只能跟随主起重机运动。

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The main bridge type crane, the erection and assembly has strict technical requirements, and a set of measurement methods to measure the installation result strictly.

桥架式桥式起重机的主体，其架设和组装都有严格的技术要求，并有一套严格的测量方法来测量安装结果。

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To install the crane span before installation, camber, level of metal structure of main girder bending, trolley rail height difference, gauge deviation, diagonal bridge survey.

安装前要对起重机安装跨度，金属结构主梁的拱度、水平旁弯，小车轨道高低差、轨距偏差，桥架对角线等进行测量。

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The main difference between the Crane invitations and the other paper offerings on the website is that they can be engraved or include letterpress printing, so that the printed messages have texture.

WSJ: Paperless Post defies digital strategy with Crane

On the main deck, crew members using a crane transferred several tons of steel beams and plating to the other ship.

NEWYORKER: Neptune��s Navy

The council said the work would be visible from street level during the weekend and the "most spectacular" part would be the removal of the tower crane's 214ft (65ft) long main jib.

BBC: Huge tower crane in Gateshead is dismantled