1. She was a fiend for chocolate and couldn't resist indulging in it every day.
她是巧克力的狂热爱好者，每天都忍不住要享用。

2. The serial killer was a fiend who had a twisted obsession with harming others.
这个连环杀手是个恶魔，执着于伤害他人。

3. He was a fiend on the basketball court, dominating his opponents with his skill and speed.
他在篮球场上是个魔鬼，以他的技巧和速度击败对手。

4. The fiendish plan to steal the crown jewels was foiled by the quick thinking of the security guards.
企图盗取皇冠珠宝的恶毒计划被保安人员机智地挫败了。

5. She was a fiend for adventure, always seeking out new and exciting experiences.
她是冒险的狂热追求者，总是寻找新奇刺激的经历。

6. The evil sorcerer was a fiend who used dark magic to manipulate and control others.
邪恶的巫师是个恶魔，利用黑暗魔法操纵和控制他人。