When a tree first starts growing in a certain area, it's likely that the 27 envelope – the temperature, humidity, rainfall patterns and so on – suits it. 气温、湿度和降雨模式
The island is hot and humid in the summer. 这个岛在夏季又热又潮湿。
The room is kept at 72 degrees and 50% relative humidity. 房间的温度保持在72度，相对湿度50%。