1. It has taken until now to pin down its exact location. 一直到现在才确定了它的准确位置。
2. He set out with an apparently simple aim: to pin down the precise meaning of the concept of "information". 他的出发点显然很简单:确定“信息”这个概念的确切含义。
3. Inspired by Halley's suggestion of a way to pin down the scale of the Solar System, teams of British and French astronomers set out on expeditions to places as diverse as India and Siberia. 受哈雷提出的确定太阳系大小的方法启发,英国和法国天文学家团队开始在印度和西伯利亚等地考察。
4. The cause of the disease is difficult to pin down precisely. 病因目前还难以解释清楚。
5. Mr Obama's views are hard to pin down. 奥巴马先生的观点则很难确定。