根据美国已经了解的情况，统计局的专家和其他人口统计学家在他们的视野中提供了一个不可抗拒的水晶球。
Working from what America already knows about itself, the bureau's experts and other demographers offer an irresistible, if clouded, crystal ball among their visions.
不用水晶球预卜未来，我们说不准明年处境如何呀。
Without a crystal ball, it's impossible to say where we'll be next year.
这些种子实际上是陨石球粒：冷却后变成玻璃球和水晶球的毫米级熔融状硅酸盐小液滴。
These seeds are actually chondrules: millimeter-sized melted droplets of silicate material that were cooled into spheres of glass and crystal.
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