1. 他裝著不認識她，其實他們暗中勾結(jié)（在一起）。
   He pretended not to know her but in fact they were in league (together).
2. 那兩個罪犯（彼此）勾結(jié)在一起。
   The two criminals were in cahoots (with each other).
3. 警察懷疑銀行職員與強盜有勾結(jié)。
   The police suspected that the bank clerk was in league with the rubbers.
4. 懷疑他（與敵人）勾結(jié)。
   He was suspected of collaborating (with the enemy).

勾的英語翻譯：

結(jié)的英語翻譯：