hydra的中文意思、音标与词形变化

n. 水螅, 九头蛇, 难以根除之祸害

n. (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones n. a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer n. trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality