One explanation for the trend to more superhot fires is that the region, which usually has dry summers, has had significantly below normal precipitation in many recent years.
对于超高温火灾增多的一种解释是，该地区夏季通常很干燥，近年来降水量明显低于正常水平。
2
They add silver iodide, dry ice and liquid nitrogen to the clouds causing immediate precipitation.
他们把碘化银、干冰及固态氮加入云层当中形成直接降雨。
3
With a dry winter, wet summer, precipitation, concentration, significant winds, four seasons and so on.