You cannot calculate upon fine weather.
你不能指望好天气.
We cannot calculate upon having fine weather for the sports meeting.
我们不能指望着开运动会时会有个好天气.
They calculate upon thirty people attending the evening party.
他们预计会有30人参加这次晚会.
I calculate upon earning 5000 pounds a year.
我预估一年可赚五千英镑.