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 was surrounded by his numerous progeny.众多的子孙簇拥着他。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。Davis was never loquacious on the subject of ...