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Replace piston rod and add flow passage on piston rod.
更换活塞杆，在活塞杆上增设流道。
youdao
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Add flow passage inside of oil cylinder to let oil run and take heat away.
油缸内增设流道使油液流动起来，带走热量。
youdao
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Add flow passage inside of oil cylinder to let oil run and take heat away.
油缸内增设流道使油液流动起来，带走热量。
youdao