2. Performance is the ability to achieve a predetermined speed, consistency and flexibility in delivery. 绩效是交付货物时达到预期的速度﹑取得一致性和灵活性的能力。
3. A check valve that controls fluid flow rates to maintain a predetermined, constant pressure upstream from the valve. 为保持阀的上游的预定不变的压力所用的控制流体流量的一种止回阀。