Was there a change in environmental conditions?
环境条件有变化吗？
Environmental conditions influence the resistance of pine host obviously.
环境条件影响松树的抗性。
Cloud seeding is also very dependent on environmental conditions like temperature and cloud composition.
人工降雨很依赖环境条件，比如温度和云层成分。
Cloud seeding is also very dependent on environmental conditions like temperature and cloud composition.
人工降雨很依赖环境条件，比如温度和云层成分。
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