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。...
我非常喜欢身材魁梧、肤色偏黑的男人。I tend to go for large dark men.打字机的色带可以是全黑的或黑红色的.Typewriter ribbons may be all black or black and red.天黑的时候, 他们组织了第三次进攻.When it was dark, they organised an attack a third time....