例句與造句

1. A variety of artificial fertilizers have been developed
   人們發(fā)明了各種人造化肥。
2. Then the need for artificial fertilizers to sustain the plants and trees would not be necessary
   如此之后對(duì)化學(xué)肥料的需求也將不再必然。
3. It's difficult to find artificial fertilizer in a sentence. 用artificial fertilizer造句挺難的