同体的

The country is a member country of EEC.

这国家是欧洲经济共同成员国。

Britain belongs to the EEC.

英国是欧洲经济共同成员国。

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同，生殖系统适于内。起源吸虫（殖纲）大多是鱼外寄生虫。