3 sentences

1. 这支部队具有极强的战斗力。

   zhè zhī bù​duì jù​yǒu jí qiáng de zhàn​dòu​lì.

   This unit has extremely strong combat effectiveness.

   Source: Dong Chinese Dictionary

2. 这支队伍训练有素，非常有战斗力。

   zhè zhī duì​wǔ xùn​liàn​yǒu​sù, fēi​cháng yǒu zhàn​dòu​lì.

   This team is well-trained and has great combat effectiveness.

   Source: Dong Chinese Dictionary

3. 为了提高部队的战斗力，士兵们每天在操场上刻苦练兵。

   wèi​le tí​gāo bù​duì de zhàn​dòu​lì, shì​bīng men měi tiān zài cāo​chǎng shàng kè​kǔ liàn​bīng.

   To improve the combat effectiveness of the troops, the soldiers train hard on the drill ground every day.

   Source: Dong Chinese Dictionary