adj.推定的；推论的
n.引入语；推导语
Roughness of the skin can be caused by bad diet. 饮食不好可能引起皮肤粗糙。
The bad news dampened our spirits. 这恶耗使得我们精神沮丧。
The incident put her in a bad mood. 这件事使她心情很不好。
It's a bad habit for a boy to toss off. 对一个男孩来说，手淫是个坏习惯。
One bad deed can blemish a good reputation. 一次不良的行为可损害好的名声。
Children's bad behavior is often a reflection on their parents. 小孩的坏品行常常有损父母的名誉。
