累计发货总量的英文表达为 "cumulative shipment volume"。
来源："累计" 的意思是 "accumulated"，"发货" 的意思是 "shipment"，"总量" 的意思是 "volume"。因此，累计发货总量的英文就是 "cumulative shipment volume"。
一些英文例句及其中文翻译：
The company has achieved a cumulative shipment volume of over 100 milpon units. (该公司的累计发货总量已超过1亿个单位。)
The cumulative shipment volume of this product has increased by 20% compared to last year. (这种产品的累计发货总量比去年增长了20%。)
Our cumulative shipment volume for the first quarter was lower than expected due to supply chain disruptions. (由于供应链中断，我们第一季度的累计发货总量低于预期。)