他们一直在用小麦交换棉花和木材。

They have been bartering wheat for cotton and timber.

《柯林斯英汉双解大词典》

她看见了一个正在用手持猎枪瞄准的男子。

She had spotted a man with a shotgun taking aim.

《柯林斯英汉双解大词典》

当时她正在用牙线剔牙。

She was flossing her teeth at the time.

《柯林斯英汉双解大词典》

So instead of having 20% of people's time spent on their own projects, I make people hang out with each other.

我让大家都待在一块儿,而不是将那20%的时间，用在自己的工作上。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选

But still is very professional and you can use it in any setting, business or casual.

但它也同样可以是很专业的表达，可以用在商务或是生活的各种语境。

Is it okay 课堂 - SpeakingMax英语口语达人

And there are a lot of questions that people are asking in using the Star Festival as a model.

人们在用“七夕“这一模型的时候,问着许多的问题。

麻省理工公开课 - 媒体、教育、市场课程节选