常見例句雙語例句We are accompanied by guides armed with flash pistols and hunting rifles, scanning the snowfields for polar bears for whom this is a seasonal migration route.陪同我們到來的向導帶著信號槍和獵槍，他們在雪地上搜尋著北極熊的蹤跡，這里正處在北極熊季節(jié)性遷移的路線上。Bird banding is one of the important means to research the seasonal migration of birds, and is an effective method in researching the faunas, ecology and morphology of birds.環(huán)志是研究鳥類季節(jié)性遷徙的重要手段之一，同時也是研究鳥類區(qū)系、生態(tài)學、形態(tài)分類學等的有效方法。Their lifestyle is semi-nomadic, and the movements are somewhat seasonal, having to do with the migration of some prey animals, and the gathering of certain plants and fruits.他們的生活方式類似于半游牧，而且甚至還跟獵物遷徙和特定果實的成熟季節(jié)有關)。權威例句Remoteness and seasonal migration for work are others.UNESCO: All Events United Nations Educational, Scientific and Cultural Organization 返回 seasonal migration