1. But the chances are against it, and there is a virtual limit on how long we can hope to remain alive, however lucky and robust we are.
    但这种可能性很小。不管我们多么幸运，多么健壮，我们所希望的长寿实际上是有限度的。

2. But other suns, stars as the astronomers call them, are bound to have planets like our own, and as the number of stars in the universe is so vast, this possibility becomes virtual certainty.
    但是，其他的太阳，既天文学家所说的恒星，肯定会有像我们地球一样的行星。因为宇宙中恒星的数目极其庞大，所以存在着产生生命星球的这种可能性是肯定无疑的。

3. While regular schools still exist, the virtual classroom plays an important role in today's learning community.
    虽然常规的学校依然存在，但虚拟课堂在今天的教学领域中起着重要的作用。

4. The possibilities are endless but in order for the information superhighway to become a reality, some concrete steps need to be taken to get the process started.
    信息高速公路带来的可能性不胜枚举，但要使其成为现实，还必须采取具体的措施来开展这一工作。

5. He is in a state of virtual slavery.
    他实际上处于一种被奴役的状态。

6. "Tough times never last but tough people do," as Robert Schuller says. In other words, face reality and be mature in your responses to life’s challenges.
    正如罗伯特·舒勒所说，“艰苦的时光终将过去，坚强的人必将苦尽甘来。”换言之，要正视现实，要用成熟的心态去迎接生活的挑战。

7. Myth and reality did join hands in at least one arena,
    但神话和事实至少在某一个舞台上共存，

8. Suddenly to find yourself with only your cat to talk to all day alters your sense of reality.
    但你一直表现得比这坚强，过去是，现在还是。

9. Pessimists believe further population growth will eventually cause a virtual collapse of public services in many cities.
    悲观主义者认为，人口的进一步增长最终将使许多城市的公共设施崩溃，

10. Providing meaningful and quality input into the virtual classroom is an essential part of online learning.
    要花时间斟酌并仔细作答，