where·on /-ˈɔn, ˈɑn/
(ad.)在什?上面,在那上面
Where·on adv.
1. On which; -- used relatively; as, the earth whereon we live.
O fair foundation laid whereon to build. --Milton.
2. On what; -- used interrogatively; as, whereon do we stand?
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whereon
adv : on which; "land whereon to grow corn"