1. All are tricky in a mine rendered unstable by the cave-in, and, in the best of cases, will take several months. 对于一个刚发生塌方仍处于不稳定状态的矿井来说，实施这两种方案都很棘手，而且，最快也需要几个月的时间。
2. The President is unlikely to cave in to demands for a public inquiry. 总统未必会屈服而同意进行公开调查。
3. It's the deepest limestone cave in the U.S. 它是美国最深的石灰岩洞穴。
4. On Christmas Eve in 1994, humans entered a cave in the mountains of southeastern France for what was probably the first time in 20,000 years. 1994年圣诞前夜，人类进入了法国东南部山区的一个洞穴，这可能是2万年来的第一次。
5. What is rather amazing, you might think, is how similar some images are, whether you're looking at a rock face in South Africa or standing inside a cave in Spain. 可能更令人惊讶的是，某些图像的相似度非常高，不管是看南非的石像面具，还是身处西班牙的岩石洞穴里。
