例句與造句

1. the structure of the cell wall has long been the object of intensive study .
   細胞壁的結構是長期以來深入研究的對象。
2. it is clear that the composition and structure of the cell wall are strictly controlled .
   現(xiàn)在已經(jīng)明白，細胞壁的成分和結構受到嚴密的控制。
3. It's difficult to find structure of the cell walls in a sentence. 用structure of the cell walls造句挺難的