深层对流和不稳定能量的释放可促使降雨的发生。
The deep convection and the release of unstable energy can act as a trigger.
如今，科学家还发现有些树木以更为独特的方式来促使降雨的发生。
Now scientists have found that trees may cause rain in more peculiar ways, too.
谷雨：降雨明显增长，促使谷类作物生长发育。
Grain rain: Rainfall increases obviously and impels cereal crops to grow.
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