Otherwise, you could end up fighting against your own biology.

否则，你最终可能会和自己的生理机能作斗争。

youdao

You'll start to see how much better it feels to be in control of what happens every day. How much more you can get done. How good it feels not to feel like the world is fighting against you.

你会开始看到当每天发生的事情都处于控制之中时的感觉是多么美好。更何况你可以做到。当发现世界不再与你为敌时的那种感觉是如此之好。

youdao

All the time you are in doubt about the cause of your illness, you are fighting against an invisible enemy.

一直以来你都在怀疑自己的病因，你是在和一个无形的敌人斗争。

《柯林斯英汉双解大词典》

Thank you for fighting against terrorism.

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For the first time ever, you saw Pakistan fighting back against violent extremists that had otherwise enjoyed safe havens.

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So you have these two fighting against each other.

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