在白天比较长的那些季节，我们会感到更加温暖，这是因为太阳光给大地带来了更多的热量。
During our long days, therefore, it is very warm with us, for the sun's rays heat the soil.
因为太阳是光，能量和热的源头，太阳光照强度和密度的变化带来了春夏秋冬季节的改变。
Because the sun is our source of light, energy and heat, the changing intensity and concentration of its rays give rise to the seasons of winter, spring, summer and fall.
以PM MA膜为参照，研究了农药氯氰菊酯在茶叶表面于人工光源和不同季节太阳光下的光分解动态。
The photolysis dynamics of Cypermethrin in tea leaf under artificial light and sunshine was investigated with special reference to that in PMMA film.
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