他是一个性格复杂的人——喜怒无常，反复多变，忧郁寡欢。
He is a complicated man-moody, mercurial, with a melancholy streak.
他是一个性格复杂的人——喜怒无常，反复多变，有些忧郁寡欢。
He is a complicated man — moody, mercurial, with a melancholy streak.
他是一个性格复杂的人--喜怒无常，反复多变，有些忧郁寡欢。
4】He is a complicated manmoody，mercurial，with a melancholy streak.
学习数学，不主张“题海”战术，而是提倡精练，即反复做一些典型的题，做到一题多解，一题多变。
Study maths, do not advocate "inscribes sea" tactics, advocate however chastening, namely thresh the problem of a few models, accomplish one problem to be solved more, one problem is changeful.
背景：肠易激综合症(IBS)是临床常见的一种慢性功能性肠病，临床症状复杂多变，长期反复发作。
Background: Irritable bowel syndrome (IBS) is a common, chronic functional disorder, due to the heterogeneity and multiplicity of symptoms, it is often recurrent in a long term.
火电厂中由于燃煤品质多变，低负荷运行时间不断积累和反复启停，使锅炉受热面积灰日益严重。
The fuel and load vary more often, start-up and shutdown times of boiler increase, average load decreases and boilers operate at low load frequently.
火电厂中由于燃煤品质多变，低负荷运行时间不断积累和反复启停，使锅炉受热面积灰日益严重。
The fuel and load vary more often, start-up and shutdown times of boiler increase, average load decreases and boilers operate at low load frequently.
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