The government has been working to secure the release of the hostages.
政府一直在努力争取使人质获释。
Professor Bonnet has been working for many years on molecules of this type.
博内特教授多年来一直在研究这类分子。
Family Health International has been working on public health issues since 1971.
国际家庭健康组织自1971年以来一直致力于公共健康问题。
他工作太辛苦了。
He has been working since noon.
他从中午就开始工作了。
他已工作了一整天。
He has been working on the paper all day.
他整天都在写论文动作是否延续下去，由上下文决定。
He has been working in the lab for two hours.
他已经在实验室里工作了两个小时。
He has been working on it for more than ten years.
他已经在公车上工作了超过十年了。
Mary has been working at the dress shop since 1994.
自1994年以来，玛丽一直在那家服装店工作。
He has been working on his new book in recent days.
近来他一直忙着写他的新书。
He is badly ill because he has been working too hard.
他因为过分劳累而病情严重。
She has been working in the World Bank for four years.
她在世界银行工作四年了。
He has been working in emergency room since I met him.
自从我上次见到他时，他就一直在急诊室工作。
The mechanical stirrer has been working for several hours.
这台机器搅拌器已连续工作好几小时了。
My mother's nephew is my brother who has been working now.
我母亲的外甥是我现在已经在工作的哥哥。
This electric generator has been working for several hours.
这台发电机已运转了几个小时。
He has been working overnight. No wonder he looks worn out.
干了一整夜，难怪他看上去很疲倦。
This woman has been working tirelessly through this campaign.
这位女性参选以来一直不知疲倦地工作着。
Microsoft has been working with Mozilla to address this issue.
微软已经联手Mozilla共同解决该问题。
She has been working the whole day, but seems to be not tired.
她已经辛辛苦苦干了一整天了，但是看上去好象一点也不累。
Mr. Roberts has been working on a design for a lighter plough.
罗伯斯先生一直在设计一种比较轻的犁。
He has been working hard, so he has made much progress recently.
他一直努力工作，所以他近来取得了很大进步。
Lambert has been working as a worker here for nearly five years.
兰伯特一直在这里当工人，几乎有五年了。
The old dustman has been working on this street for twenty years.
这个老清洁工达条街上干了20年了。
While we have been at sea, Jeanie has been working on a seal skin.
在我们喝茶的时候，珍妮正在加工一张海豹皮。
The company has been working on creating the store for four years.
该公司四年来一直致力于打造这种商店。
The company has been working on creating the store for four years.
该公司四年来一直致力于打造这种商店。
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