This act was a signal to his victim's friends that he was someone to be reckoned with.

这一举动是给为他所害者的朋友们的一个信号，告诉他们他是个必须被小心对付的人。

They were already a political force to be reckoned with.

他们已经成为一支不容忽视的政治力量。

Still A Force To Be Reckoned With

仍有一股力量不可低估

She is a woman to be reckoned with.

她是将被考虑的一位女性。

This is also a force to be reckoned with.

这也是一股不可忽视的力量。