I'm calling from downtown Ottawa.是什么意思？

I'm calling from downtown Ottawa.

我是在渥太华市中心打电话.

calling

n. 呼喊，（从事某职业或活动的）欲望，职业，邀请；v. 叫( call的现在分词)，通电话，认为，估计；

例句
The workforce have recently been calling for their working hours to be reduced. Many companies have accordingly switched to a five-day week.
工人们最近一直在呼吁缩短工作时间。许多公司于是转成了一周五天工作制。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

downtown

adv. 在商业（闹市）区，到闹市区；adj. 商业区的，市中心的；

例句
The museum campus occupies 3.2 acres in the heart of downtown Akron.
博物馆校园占地三点二英亩在市中心阿克伦.

Ottawa

n. 渥太华（加拿大首都）；

例句
In 1937 he was seconded to the Royal Canadian Air Force in Ottawa as air armament adviser...
1937 年他被临时调往渥太华的加拿大皇家空军担任军备顾问。