supposing
conj. 假定，假设
v. 认为，料想；假定，假设；（婉转表达建议等）我看，要不；需以……为条件；认为应该（suppose 的现在分词）
例句
Supposing (that) you are wrong, what will you do then?
假设你错了，那你会怎么办？
《牛津词典》
So, supposing that you are sitting in a company meeting and the presenter puts up the first slide.
那么假设你在公司开会，演讲者打开了第一张幻灯片。
But supposing he sees us?
可他要是看见我们呢？
