The effect of root on soil respiration was observed mainly before repining stage with fluctuation.种有水稻,根系对土壤总的呼吸影响主要体现在成熟期之前,且有相互消长的现象.Cost price, nowaday value, time, fluctuation rate, un - venture gainings rate are imp...
He may have been to some of those places.那些地方他也许去过一些。Those who have been to Dalian all say it's beautiful.凡是去过大连的人都说大连很美.I have been to see John.我去看过约翰了....
地球的磁层既具有保护的功能,却又极其危险。The earth's magnetosphere is at once protective and dangerous.在磁层顶合成3D磁结构的聚类观测.Cluster observations of complex 3 D magnetic structures at the magnetopause.本文解出了三维磁层顶的Chapman-Ferraro模型.Chapman - ...