jam on it的用法和樣例：
例句
- It's only human nature to want a comfortable life.
想過舒適的生活不過是普通人的本性。 - It's nice and warm sitting by the fire.
坐在爐火旁挺溫暖舒適。 - It was pure luck that he was home when we called.
非常幸運，我們打電話時他在家里。 - Luckily there was a doctor on the spot.
幸運的是現場有一位醫生。
詞匯搭配
- have jam on it 十分走運
