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red tide
environ.	赤潮汐
nautic., econ.	红潮
oil	赤潮
space	红潮 (又称赤潮，海水变红的现象)
tech.	苦潮
red tide Sea water which is covered or discoloured by the sudden growth of algal bloom or by a great increase in single-celled organisms, dinoflagellates. Red tides are often fatal to many forms of marine life and, in some cases, can result in human deaths because the dinoflagellates are eaten by clams and mussels which concentrate the paralysing toxins which they produce
environ.	红潮 (海水被突然大量生长的海藻或大量增加的单细胞生物或甲藻覆盖或染色。)

red tide : 7 phrases in 3 subjects

Ecology	2
Fishery fishing industry	1
Technology	4