然而，在世界各地的沙漠中的这些构造或类似的构造上，一些“凶猛”的植物已经适应了在不断变化的条件下生存。
Yet on these and similar formations in deserts around the world, a few fierce plants have adapted to endure under ever-changing conditions.
“基本上，这些疾病之所以会一直存在或卷土重来，在于细菌有时候会产生一些变化。”维恩·伯格(Weinberg)说。
"Basically, the factors that lead to why diseases stick around, or come back, is because sometimes the germs change a little," Weinberg said.
更微妙一些的变化可能会包括衣着和化妆风格的改变，或佩带首饰的增减。
Subtle signs might include a change in style of clothing, makeup or the amount of jewelry a person wears.
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