unavoidably

I have been unavoidably prevented from coming.

我身不由己, 不能前往。

The operation unavoidably caused the patient much pain.

手术不免会导致病人更多的疼痛。

But unavoidably, the heart forms , what may melt rain , wrong wrong kermes button.

奈心结，何堪化雨，错错胭脂扣。