求翻译：履带式起重机是在行走的履带式底盘上装有行走装置、起重装置、变幅装置、回转装置的起重机。履带式起重机有一个独立的能源,结构紧凑、外形尺寸相对较小,机动性好,可满足工程起重机流动性的要求,比较适合建筑施工的需要,达到作业现场就可随时技入工作。是什么意思？

Crawler crane is in walking on a crawler chassis with running gear, lifting gear, luffing devices, crane slewing device. Crawler cranes have an independent energy, compact structure, and relatively small size, good mobility, can meet the liquidity requirements of cranes, more suitable for constructi

crawler cranes are walking in the crawler-mounted on chassis Powered devices, lifting gear, change gear, Rotary installations of cranes. crawler cranes are an independent energy, compact, and relatively small size, good mobility, which can meet the requirements for mobility engineering cranes, which

The crawler crane is in on the marching chassis which walks is loaded with walks the installment, the hoisting device, the amplitude installment, the turning gear hoist crane.The crawler crane has an independent energy, the structure compact, the external dimensions relative small, the mobility is g

Crawler cranes are walking crawler chassis is equipped with appliances, lifting gear, walking crane luffing device, turning device. Crawler crane is an independent energy, compact shape and relatively small size, mobility, and can meet the crane liquidity requirements, more suitable for construction