人工降雨的短期及长期效果都难以评估。
The results of the seeding technology both shortcoming and long-term are difficult to assess.
没有人能够拿出有据可考的降雨量长期趋势分析报告，以证明该岛的降雨量与绿化有关，这并不奇怪。
No one has documented any long-term trend in rainfall in response to the plantings, which is not surprising.
该国已经遭受严重的干旱、暴风和沿海洪水的影响，并对降雨量将在作物最初生长期增加的预测感到十分担忧。
The country already suffers from droughts, cyclones and coastal flooding, and is worried about projections that rainfall will decrease during the primary growing season.
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