Moon jellies and their cousins, which include lion's mane jellies and sea nettles, are known astrue jellies. They belong to the class Scyphozoa, in the phylum Cnidaria, which also includescorals. (A phylum is such a broad taxonomic category that humans, fish, snakes, frogs, andall other animals with a backbone belong to the same one -- the chordates -- as do salps, whichare sometimes lumped with jellies.) As adults, true jellies are shaped like upside-down saucersor billowing parachutes. They propel themselves through the water by contracting the musclesof their bells, and their tentacles are equipped with stinging cells that shoot out tiny barbedtubes to harpoon floating prey. To reel it into their mouths, they use streamer-like appendagesknown as oral arms. In some species the oral arms have mouths of their own.
Jellyfish like the dreaded Portuguese man-of-war are also related to corals, but they're part ofa different subgroup, the siphonophores, which practice an unusual form of collective living. What looks like a single man-of-war is technically a colony that developed from the sameembryo. Instead of simply growing larger, the embryo sprouts new "bodies," which take ondifferent functions. Some develop into tentacles, for example; others become reproductiveorgans.
1.belong to 属于
These narrations seemed to belong to another age.
这种叙述好像是属于另一时代的。
2.be lumped with 归在一起
The budget for saving should not be lumped with the disaster fund.
救济预算不应与救灾资金归在一起。
3.be related to 与…有亲缘关系
I am related to her by marriage.
我和她有姻亲关系。
(来源:可可英语)
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