1、But also be firm in making your complaint.
但投訴時(shí)也要堅(jiān)定。

2、Be firm in making your complaint.
投訴時(shí)要堅(jiān)定。

3、Plan carefully and be firm in what you want to achieve.
仔細(xì)地計(jì)劃，在你想要達(dá)成的方面堅(jiān)定不移。

be firm in翻譯