例句與造句

1. The general thickening from the southwest towards the northeast and north , combined with increasing of fine clastic to the northeast and north , indicate principle source of the upper kongdian formation from the southwest and south
   自南而北地層逐漸加厚、細(xì)粒沉積物含量以及地層內(nèi)部反射結(jié)構(gòu)表明孔店組沉積時(shí)期物源來自研究區(qū)南部。
2. It's difficult to find principle source in a sentence. 用principle source造句挺難的