3 sentences

1. 这款软件是提高工作效率的利器。

   zhè kuǎn ruǎn​jiàn shì tí​gāo gōng​zuò xiào​lǜ de lì​qì.

   This software is a powerful tool for improving work efficiency.

   Source: Dong Chinese Dictionary

2. 这把短剑锋利无比，确是一件近战利器。

   zhè bǎ duǎn jiàn fēng​lì wú​bǐ, què​shì yī jiàn jìn​zhàn lì​qì.

   This dagger is incredibly sharp and is indeed a powerful weapon for close combat.

   Source: Dong Chinese Dictionary

3. 此人胸怀大志，才华横溢，实为国家之利器。

   cǐ rén xiōng​huái​dà​zhì, cái​huá​héng​yì, shí wéi guó​jiā zhī lì​qì.

   This man has great ambitions and overflowing talent; he is truly a great asset to the nation.

   Source: Dong Chinese Dictionary