jam on it的用法和样例：
例句
- It's only human nature to want a comfortable life.
想过舒适的生活不过是普通人的本性。 - It's nice and warm sitting by the fire.
坐在炉火旁挺温暖舒适。 - It was pure luck that he was home when we called.
非常幸运，我们打电话时他在家里。 - Luckily there was a doctor on the spot.
幸运的是现场有一位医生。
词汇搭配
- have jam on it 十分走运
