日文汉字的发音中有吴音、音 、 音及惯用音之分;有音读和训读之别; 还有同音和通音等等.The same kanji are pronounced, sometimes regularly just like the Chinese characters, sometimes totally differently....
汗是一种排泄物.Sweat is an excretion.环境工程师们关心人类排泄物的处置.Environmental engineers are concerned with the disposal of human wastes.汗也是一种排泄物.Sweat is also an excretion....