1.Robust health systems are essential to maintain surveillance and response capacity in the face of pandemic threats.
强健的卫生系统对于维持监测和应对能力，面对大流行的威胁至关重要。
2.At this stage, it is important to maintain surveillance and update pandemic preparedness and response plans accordingly.
在这个阶段，重要的是要保持监测和更新大流行病的防备和应对计划。
3.It is necessary to maintain surveillance on these meters .
必须对这些仪表保持经常性的监测。
4.maintain surveillance of unusual flu-like illness & severe pneumonia;
维持对不寻常的流感样疾病和严重肺炎的监测；