minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms
minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae
例句
用作名词 (n.)
Walter jumps all over the place like a water flea. 瓦尔特跳来跳去，活象个水蚤。
美
