瞄准镜和弹道平行吗:upon completing its inspection should the seller's inspection reveal

upon completing its inspection should the seller's inspection reveal Its possible effects upon other people have interested me very little Singapore depends upon Johor for about half of its daily supply of portable water Stumble Upon oil for mud or completing well upon presentation 中的upon 怎么解释 improve upon怎么用 once upon a time available upon request是什么意思? available upon request