车身重量约占整车重量的40%左右，因此车身轻量化对于整车的轻量化起着举足轻重的作用。
Weight reduction of body structure plays a rather important role in lightweight of full vehicle, for body structure weights about 40 percent of full vehicle.
设计敞篷车的挑战在于既要保持出色的车身扭转刚性，又要减轻重量。
The challenge in designing any convertible lies in retaining a high degree of torsional rigidity throughout the body while keeping weight down.
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