例句與造句

1. After long terms culture under al stress , the root system of untransformed control was soft and rotted and covered with purple bacterium . we compared root tip , root collar and root - stem transition region and found the transgenic plants have relative normal root system
   鋁溶液長期處理的根系外部形態(tài)具有較大差異，從根尖、根中部和根莖交接處做了比較，發(fā)現(xiàn)對照的根系軟腐并有紫色菌著生，而轉(zhuǎn)基因植株根系相對保持正常。
2. It's difficult to find root collar in a sentence. 用root collar造句挺難的