论文部分内容阅读
我家楼下的楼道里多了个燕子窝,那是燕爸爸和燕妈妈经过很多天,辛辛苦苦用嘴衔泥一点点地垒起来的。
My house downstairs corridor in a swallow nest, it is Yan Dad and Yan mother after many days, hard to use mouth to mud a little bit up.