Selecting parents with medium genetic distance may probably gain stronger heterosis.在亲本选配时,应选择遗传距离中等偏大的材料.He made splendid achievements in starting and promoting the use of hybrid heterosis.他在水稻杂交优势利用的开创和发展方面成就卓越....
这些订单将给英国的造船厂注入一线生机。The orders will throw a lifeline to Britain's shipyards.该造船厂的造船技术处于世界最前沿。This shipyard is at the cutting edge of world shipbuilding technology.到20世纪60年代，许多造船厂都在勉强支撑。By the 1960s, many shipyards we...