Frogs eat pests which destroy crops and carry diseases.青蛙吃破坏庄稼、传播疾病的害虫。This wet area also attracts frogs, toads and newts.这片潮湿地区也吸引了青蛙、蟾蜍和蝾螈一类的生物。the croaking of frogs蛙鸣...
In 1857 Mendel started experimenting with peas in his monastery garden.1857年,孟德尔开始在修道院的菜园里用豌豆做实验。Mendel tried crossbreeding.孟德尔尝试了杂交育种。Examples are Mendel's pea characters.例如孟德尔的豌豆的性状....