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”。
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。
The plane had been planting seed for nearly a month when it began to rain.
飞机播种了近一个月，这时天才下雨。
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