the swallows fly meaning in English

燕双飞

How do explain the swallows flying back to san juan capistrano
怎解释燕子飞返圣约翰大教堂？
Wait till the swallows fly away
等燕子飞走了以后去弄。
The spring is coming . the swallow flies to the north of the country area
春天来了。燕子飞回国家北部地区。
The swallow flies high , the lark flies higher , the eagle flies highest
燕子飞得高，云雀飞得更高，鹰飞得最高。
The swallow flies away and it will come back again . the willows dries up and it will bud again . and the peachblossom withers away and it will bloom up again
燕子去了，有再来的时候；杨柳枯了，有再青的时候；桃花谢了，有再开的时候。