Cranes--from a simple pulley, to mobile surface cranes, on up to tower and gantry cranes--all serve in assembly processes of various sizes. The bigger the crane, the more nimbly it can move heavy loads.
從最簡單的滑輪到地面移動吊車，乃至塔吊車、門形吊車，協助了一連串小組合、中組合、大組合的過程，而越是「高高在上」的吊車，越能將大噸位的物料便捷移動。