Assembling them is labour-intensive, and so is making the parts that outside suppliers provide to the shipyards.
供应商制造向船厂提供的零部件,以及组装这些部件都是劳动密集型的工作。
Business Vocabulary in Use Advanced 3rd Ed
Outsourcing is when organizations pay subcontractors – outside suppliers – to do work that was previously carried out in-house (see, for example, the first three combinations below).