To tell the truth, confidence is my secret weapon.

说实话，自信是我的秘密武器。

youdao

I have to also tell you that my sense of humour is my secret weapon.

我还得告诉你，我的幽默感是个秘密武器。

youdao

Work in some speed training. This is my secret weapon for huge improvement.

进行一些速度训练，这是我的秘密武器，可以明显地提高体能。

youdao

The Segway, I had thought, would be my secret weapon in the struggle against the pump-powered lifestyle.

FORBES: Magazine Article

Now my underwear is to be viewed as a secret weapon.

CNN: The case for firing Janet Napolitano