Scientists have bred new hybrid plants and animals which yield more food. 科学家培育的许多新的杂交植物和动物，提供了更多的食物。
Compared to traditional crossbreeding, gene splicing takes about half as much time to develop a new crop or animal variety. 与传统的杂交育种相比，基因剪接约需多半的时间开发一种新的作物或动物品种。
The half-caste engineer begged and pleaded to stop the engine for half an hour in order to cool it and attend to the water circulation. 混血轮机手再三要求，让机器停下半个小时，等稍微冷却以后，检修一下水循环系统。
