Translation of "Firmly" in Chinese

He clutched her arm firmly.

他牢牢地抓住了她的手臂。

He held on firmly to the branch.

他紧紧抓住树枝。

I have my feet firmly planted on the ground.

我是个脚踏实地的人。

She is firmly determined to own a store of her own.

她下定決心要擁有自己的店。

Make sure that the device is attached firmly to the ceiling.

请确认装置牢牢地固定在天花板上了。