A burro is carrying salt of one large bag backcross a river.有一头驴子驮着一大袋子盐过河.The method can be conveniently applied to practical backcross breeding programs.该方法可以很方便地应用于实际的回交育种....
Some of the food crops failed. However, the cotton did quite well.有些粮食作物歉收。但棉花的收成仍相当不错。Because it was warm, David wore only a white cotton shirt.因为天气暖和，戴维只穿了一件白色的棉衬衣。Prices start at £13.95 a metre for printed cotton.印花棉布...
格雷戈里和卡门说了知心话。Gregory shared confidences with Carmen.他把我告诉他的知心话告诉了每个人.He blab bed my confidences to every one.直到朱迪思来,他们的知心话才告一段落.Their confidence lasted until Judith appeared....