原级：ostrich
1. 鸵鸟：其他一些动植物特征比如鸵鸟(ostriches)的翅膀,也许曾今变成这样是为了适应环境,但是现在它的存在已经偏离了原始目的. 这些已经退化的特征依然保留是因为它们已经独立了,或者是它们被另作他用,或者那儿没有足够强大的进化力量让它们消失虽然拥有它们已经变得不利.
1. Unlike wild ostriches, those raised for the purpose of eating are not legally protected.
2. The farm breeds ostriches for meat, leather and eggs and also offer visitors a chance to ride the animals.
3. Ostriches are the largest living birds, but their heads are pretty small.
4. They must find out where the " ostriches " live companies that are big, but move and react slowly.
5. The garden also houses eight fat black bears and dozens of ostriches.
6. Until now, both countries have behaved like ostriches sticking their heads in the sand.