annelids

Trace-making organisms in modern lacustrine environments are mainly benthic oligochaete annelids. Crustaceans, bivalves and gastropods, insect larvae.

现代湖泊中的造迹生物以底栖的寡毛类蠕虫、甲壳动物、软体动物的双壳类和腹足类、昆虫幼虫为主。

Hermaphroditic aquatic or terrestrial or parasitic annelids. Most mammals live on land.

雌雄同体的水生陆生或寄生环节动物。大多数哺乳动物生活在陆地上。

Hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body.

雌雄同体的陆栖和水栖环节动物，只在沿身体部位有鬃毛。

Discuss the metamerism of annelids and its advantages briefly.

浅谈环节动物身体的分节现象及其优点.

A similar enlargement in the digestive tract of annelids and insects.

环节动物或昆虫的消化道中的类似扩大部分。

Annelids are soft, moist worms which have rings around their bodies.

环节动物是柔软、黏湿的蠕虫，身体周围有环节。