插足

wǒ cāi cè yī dìng shì yǒu dì sān zhě chā zú

我猜测一定是有第三者插足。

I gather there must be a third person involved.

yīn wèi dì sān zhě chā zú nà duì fū fù lí hūn le

因为第三者插足，那对夫妇离婚了。

The couple divorced because there was another person came between them.

nà ge hēi rén bù yuàn yì zhí jiē chā zú zhèng zhì

那个黑人不愿意直接插足政治。

The blackman shrank from any direct participation in politics.