等变线...

isograde的音标：isograde的英式发音音标为：[aɪsəʊɡ'reɪd]isograde的美式发音音标为：[aɪsoʊɡ'reɪd]...

等变质级...

isograd的音标：isograd的英式发音音标为：[aɪsəʊɡ'ræd]isograd的美式发音音标为：[aɪsoʊɡ'ræd]...

isogradient的音标：isogradient的英式发音音标为：[aɪsəʊɡ'reɪdɪənt]isogradient的美式发音音标为：[aɪsoʊɡ'reɪdɪrnt]...

等梯度线...