Gate: The point at which a management decision is made to allow the product development project to proceed to the next stage, to recycle back into the current stage to better complete some of the tasks, or to terminate. The number of gates varies by company. (See Chapter 21 in The PDMA HandBook 2nd Edition).
关口:产品开发项目进入下一阶段的决策点，以决定是继续或停留在现阶段以更好完成任务，还是停止任务。不同公司的关口数不同。(参见PDMA新产品开发手册第二版第21章)
