科学家们至今还不清楚为何恐龙会灭绝，但是一些理论假定地理，气候，海面等因素的变化导致了恐龙的灭绝。
园艺科学利用了其他科学的信息，主要关注的是产量的最大化和极高的质量。
雪保持了较低的水平面的热量而帮助了农民们，从而保护了农作物种子免于冻坏。
Scientists do not know why dinosaurs became extinct,but some theories postulate that the changers in geography,climate,sea levels were responsible.
The science of horticulture,in which primary concerns are maxmium yield and superior quality,utilizes the information derived from other sciences.
Snow aids farmers by keeping heat in the lower ground levels,thereby saving the seeds from freezing.
