invincible
释义：形容词，意思是“无敌的，不可战胜的”，可在留学文书里描述自己或自己的团队是无法被征服的，也可以描述自己的信念是不可动摇的，不可改变的。
例句：
Even if they did penetrate, we would be invincible in glory.
The Taliban are not invincible superwarriors hardened by millennia of fighting and xenophobia; indeed, they are hardly even very competent insurgents compared to Nepal's Maoists, Sri Lanka's Tamil Tigers, or Colombia's FARC.