For moisture in the air to condense and form precipitations, what’s missing is “core” or “heart”. Such core can be mass-produced in production lines.
无论在多么干燥的空气环境中，大气中也充满了微量的水蒸气、湿气。使这些湿气凝结降雨，缺少的只是“核”或“心” – 也就是气压相对较高的区域。
For moisture in the air to condense and form precipitations, what’s missing is “core” or “heart”. Such core can be mass-produced in production lines.
无论在多么干燥的空气环境中，大气中也充满了微量的水蒸气、湿气。使这些湿气凝结降雨，缺少的只是“核”或“心” – 也就是气压相对较高的区域。