call on 有拜访、号召、请求、访问 等意思
call upon 有 号召、要求、访问的意思
on 和upon 一般都是通用的，但是在时间中不能用upon，在固定短语中不能互换，另外，upon不如on通俗
此处用 on 和upon 都可以，但是upon显得更正规
upon
prep. 根据；接近；在…之上
英语问题but all of us are called upon daily to make a great many
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