If you ask me, now is a perfectly reasonable time to be analyzing such possible causal relationships, like the one between climate change and earthquakes (which set off tsunamis).
如果要我说的话，现在是分析这些因果关系的最佳时间，例如气候变化和地震的关系(引起海啸的那种)。
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It's hardly clear that there is a causal relationship between optimism and health; it could be that they are related to the same underlying gene complex or set of mechanisms.