Sometimes, they cut across many parallel activities; for instance, a prototype of the eventual product or a mock-up of the new brochure format.
Sometimes, they cut across many parallel activities; for instance, a prototype of the eventual product or a mock-up of the new brochure format.
而有时，这些出现在接近的并行流程中，比如，最终产品原型或新规格的实物模型。