不良现象描述英文

there are some bad phenomena in our class.some students do bad deeds ,such as talking in class,paying no attention to the teacher,having bad manners,cheating in the exams and so on.. these bad deeds have a bad effect on our studying .we should get rid of the bad behaviour and try our best to be strict with ourselves in order to study better for our future!有一些不良现象在我们班。一些学生做不好的行为,如在课堂上说话,不听老师讲,不讲礼貌,考试作弊等等. .这些坏的行为有很坏的影响我们的学习。我们应该摆脱掉这种坏行为和尽力严格自己,以便更好的学习对我们的未来!（汉语是机器翻译，不太通顺，你看懂就行了）

malignant phenomenon 表示不良现象或者 vacious phenomenon 表示有害现象这两个都好，而且都极具专业型有问题追问我哦

主观表述：undesirable phenomena客观表述：adverse phenomena，misconduct phenomena

流痕(Flow Line)熔接线(Weld Line)凹陷(Sink Mark)条纹(Streak) 翘曲(Warpage)