深挖

wǒ men děi shēn wā cái néng zhǎo dào gēn bù

我们得深挖才能找到根部。

We'll have to dig deep to get at the roots.

nǐ bì xū shēn wā nǐ de qián bāo yǐ zhǎo dào yào shi

你必须深挖你的钱包，以找到钥匙。

You'll have to dig deep into your wallet to find your key.