这种疾病传播的条件已经成熟。The conditions are ripe for the spread of disease.我不开车，公共汽车条件又太糟糕。I don't drive and the buses are quite hopeless.此处提及的实验证据有诸多限制条件。The empirical evidence considered here is subject to many qualification...
Was it an accident or did David do it on purpose?是意外还是戴维故意所为？I don't think he stepped on your toes on purpose.我想他不是有意伤害你的感情.She sometimes does things on purpose just to annoy me.她有时存心做些事来使我生气....