The discovery of the cowpox vaccination let the danger of vaccination more less, and cost lest.牛痘术的发明使种痘的危险性更小, 花费也降到最低,故而很快在全世界推广开来.In nineteen century, Enligh doctor Pearson came to Macao to spread the cowpox vaccinati...
The Royal Greenwich Observatory was founded to observe and catalogue the stars.当初创立皇家格林尼治天文台就是为了观察星体并对其进行编目。Few museums could rival the Old Royal Observatory at Greenwich for a grand day out...若想找个地儿开心地逛一天，没有哪家博物馆能比得上格林尼...
I realise that an Englishman who generalises about Ireland invites trouble.我意识到英国人如果对爱尔兰问题加以泛化的话会招惹麻烦。A child first labels the household pet cat as a "cat" and then generalises this label to other animals that look like ...
种间杂交的主要障碍是F1代的不育性.A major barrier to interspecific hybridization is sterility in the F 1 progeny.那是一株杂交的四季开花的蔷薇.That is a hybrid perpetual rose.骡子是一种杂交的变态产物, 本来是不该饲养的.Mules are misbegotten, unnatural critters and it ough...