isobar

n line on a map, esp a weather chart, joining places with the same atmospheric pressure at a particular time 等压线.

irritant, irritate, irritating, irritation, irruption, is, is(o)-, Isaac Newton, ISBN, ISD, isinglass, Islam, Islamic, island, islander, isle, islet, ism, isn't, ISO, isolate, isolated, isolation, isolation hospital, isolation ward, isolationism, isolationist, isometric, isomorph, isomorphic, isosceles, isotherm, isotope, issue, issue from, isthmus, it, It goes without saying that, it happens that, it is likely that, it is no use doing...,