1. Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were responsible.
1.科学家们不知道为什么恐龙会灭绝,但是有些人提出了恐龙的灭绝和地理,气候和海平面面的变化有直接联系的理论.
2. The science of horticulture, in which the primary concerns are maximum yield and superior quality, utilizes inFORMation derived from other sciences.
2.园艺学,是一门关注最大领域和更高的质量,利用别的学科的派生知识的学科.
3.Snow aids farmers by keeping heat in the lower ground levels, thereby saving the seeds from freezing.
3.雪通过在地平线下加热,然后冷冻来帮助农民保存种籽. |