论文部分内容阅读
“小燕子,穿花衣,年年春天来这里……”这首创作于上世纪50年代中期的歌曲,至今依然是幼儿园最常传唱的歌曲之一。在自然界,燕子是很称职的父母。在北方,每年春天,燕子归来,它们最主要的工作就是繁衍后代。燕子衔泥做窝的辛苦众所周知。除了做窝,燕子哺育后代更是尽职尽责,辛勤忙碌,一刻不停。燕子孵卵,每窝4-6枚卵。小雏燕从卵壳里出来时,眼睛还没有睁开,张开大嘴,就知道要食吃。雏燕出壳,一个星期后才会长出羽毛,在这个星期内,燕子夫妇不会外出觅食,而是在窝边守着它们,直到孩子长得稍大一点,燕子夫妇就会忙碌起来。
“Swallow, wears flowers, come spring every year ...... ” This first song of the mid 50s of last century is still one of the most sung songs in kindergarten. In nature, swallows are very competent parents. In the north, every spring, swallows come back and their main job is to breed offspring. Swallows mud nude nest well known. In addition to nest, swallow nurturing offspring is due diligence, hard-working, non-stop moment. Swallow hatch, 4-6 eggs per litter. Small young Yan came out from the egg shell, the eyes have not opened, open mouth, you know to eat. Chu Yan excreted, a week later will grow feathers, this week, swallows and couples will not go out for food, but keep them in the nest, until the child grow slightly larger, swallows and couples will be busy .