Near the end of Devonian times, thirty percent of all animal life vanished.在泥盆纪末期，30％的动物物种都灭绝了。The contact relationship between Silurian and Devonian is parallel unconformity.泥盆系与志留系之间为平行不整合接触.Blooming of Bacteria and Al...
Data and constraints can easily be changed to test theories.信息库中的数据和限制条件可以轻易地改变以检验假设.Are there any moral constraints on politics in Machiavelli's view?在马基维里的观点中是否存在着对政治的道德限制?He is wanting in moral constraints.他缺少道德约...
By happy coincidence, Robert met Richard and Julia and discovered they were experiencing similar problems.幸运的是，罗伯特碰巧遇到了理查德和朱莉娅，发现原来他们也碰到了类似的问题。The economy is experiencing an upturn.经济正在好转。Many poor households are experie...