A major barrier to interspecific hybridization is sterility in the F 1 progeny.种间杂交的主要障碍是F1代的不育性.Among its many progeny, the 1944 Education Act gave birth to the modern youth service.在1944年通过的《教育法案》的诸多衍生条款中，就包括了现代青年教育服务。...
He is not attempting necessarily to reproduce the cadence of speech.他不想刻意重复那种讲话的语调。We are grateful to you for permission to reproduce this article.非常感谢您允许我们复印这篇文章。The enclosed photograph is unfortunately not good enough ...