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1. They said that they should check up and repair the machines.
   他们说过要检修这些机器。
2. Service of check valve components shall be through a single stainless steel access cover secured with stainless steel bolts.
   维修止回阀部件应该通过唯一的用不锈钢螺栓紧固的不锈钢检修盖进入进行。