1. As if you could outrun me! As if you could fight me off.

【译文】似乎你可以超越我! 似乎你可以打败我。

【解析】fight off 击败

He fought off the cold by taking aspirin.
他服阿斯匹林来治疗感冒。

The firm has to fight off a lot of competition to win the contract.
这家公司得击败许多对手才能赢得合同。

2. I'm designed to kill.

【译文】我生来就是为了杀人。

【解析】be designed to 某（东西，物，计划，图谋，或者）被计划用于...

The bombardments were designed to destroy the beach guns.
炮击用来摧毁滩头堡垒。

This room was designed for the children/designed as a children's playroom.
这个房间预定留给孩子们用/留作孩子们的游戏室。