字典解释

“presumably”是副词，意思是“大概、可能”，它的动词是 presume。很多人可能在阅读中见到过 presumably，但一直没学会如何使用。当我们想表达一种可能性时，我们会说 I assume/suppose/presume/guess，其实这时候也可以试试 presumably。尤其是较正式的写作和口语中，灵活使用 presumably 可以增强表达的丰富性。

一家开了好多年的餐厅最近关门了，我们猜测可能是因为房租太高
The restaurant that has been around for many years recently went out of business, presumably because the rent prices went up too much.

很多互联网公司在2018年第四季度大量裁员，虽然他们自己会说这是正常的人事调整，但很多分析家会认为这是公司融资不足的表现
The fourth quarter of 2018 saw massive lay-offs in many technology companies, which, according to analysts, presumably means they failed to raise the funds they needed.

例句

《经济学人》中关于阿富汗文章中用到的presumably
Many analysts wonder whether the Afghan army can sustain such punishing losses in the long run, let alone the higher casualties that would presumably follow if it lost American training and air support.

翻译

教授的航班又晚点了，大概是恶劣的天气所致吧。
The professor’s flight was late, presumably because of the bad weather.

参考翻译
The professors’s flight was delayed again, presumably because of the bad weather.

或者

Presumably, the bad weather delayed the professor’s flight.