harmful habit

• 不良习惯

harmful habit的用法和样例：

例句

1. It is a bad habit to bolt your food.
   不加咀嚼，狼吞虎咽地吃东西是个不良习惯。
2. What pulls the student away from moving forward is nothing but his bad habit and lack of perseverance.
   妨碍这个学生进步的正是他的不良习惯和缺乏毅力。