如何使用 "task" 造句

1. It was not an easy task .
这不是个简单的任务。
2. So some workmen were assigned the task .
所以一些工人被分配到这个工作。
3. Suing the ultimate chinese culprit is a thankless task .
起诉最终的中国责任人是件费力不讨好的差事。
4. But it was an unpleasant task to make him hear me .
但令他听见我说话可不是件优差。
5. A panel at the national research council recently took on the task of studying longevity .
国家研究委员会(nationalresearchcouncil)的一个专家小组承担了研究长寿的课题。