我们在田里耕作的时候,又下起雨来了.The rain came on again while we were working in the fields.古代农民发展了在沙漠耕作的几种方法.Ancient farmers developed several Methods: To farm the desert.用马耕作的现象在贫苦农民中仍然十分普遍.The use of horses for ploughing still preva...
Dr Blackwell studies a group of quorum - sensing molecules called acylated homoserine lactones ( AHLs ).Blackwell博士研究了群体感应中的一种叫做酰基高丝氨酸内酯 ( AHLs ) 分子.N - acylhomoserine lactone ( AHL ), as quorum sensing signals, regulate...