These very short-lived plants reproduce prolifically; that is to say they provide a constant rain of seed in the neighborhood of parent plants.

这些寿命极短的植物大量繁殖；也就是说，它们在母株周围持续提供着“种子雨”。

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Without some moisture already in the system, and without the right clouds to seed, there is little that scientists can do to induce rain.

如果云中没有一定的湿度，没有适合的云来作催化，科学家就很难引发降雨。

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Without some moisture already in the system, and without the right clouds to seed, there is little that scientists can do to induce rain.

如果云中没有一定的湿度，没有适合的云来作催化，科学家就很难引发降雨。

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