3) Birds incubate eggs.
鸟孵卵。
4) Birds lay hard-shelled eggs.
鸟卵是硬壳的，
5) Birds reproduce by laying eggs.
鸟类由产卵繁殖。
6) bird
[英][bɜ:d] [美][bɝd]
鸟
1.
Detection of antibodies against porcine reproductive and respiratory syndrome virus(PRRSV) from birds in Shanghai;
上海地区野鸟和家禽中PRRSV抗体的血清学调查
2.
Antiseptic and Insect-preventive Innovation of Making and Preserving the Stone Bird Specimens;
鸟类剥制标本在制作和保存中防腐、防虫的技术研究
3.
From War to Amalgamation :Looking at the Relationship Between Fish and Bird from the Designs on the Chromatic Pottery of Yangshao Culture;
从鱼鸟相战到鱼鸟相融──仰韶文化鱼鸟彩陶图试析
补充资料：鸟卵
| 鸟卵 bird's eggs &nb |