这家初创公司通过在硅谷设立办公室，获得了在美国市场的立足点。

The startup gained a ___toehold in the US market by opening an office in Silicon Valley.

她在悬崖上找到一个微小的立足点，继续向上攀登。

She found a small ___toehold on the cliff to continue her climb.