资料来源 : Webster's Revised Unabridged Dictionary (1913)

Water tender \Water tender\ (Nav.)
   In the United States navy, a first-class petty officer in
   charge in a fireroom. He ``tends'' water to the boilers, sees
   that fires are properly cleaned and stoked, etc. There is
   also a rating of {chief water tender}, who is a chief petty
   officer.