2 sentences

1. 他仔细地观察着这把古剑的锋。

   tā zǐ​xì de guān​chá zhe zhè bǎ gǔ​jiàn de fēng.

   He carefully observed the tip of this ancient sword.

   Source: Dong Chinese Dictionary

2. 大军以精锐骑兵为锋，迅速突破了敌人的防线。

   dà​jūn yǐ jīng​ruì qí​bīng wéi fēng, xùn​sù tū​pò le dí​rén de fáng​xiàn.

   The army used elite cavalry as the spearhead and quickly broke through the enemy's defense line.

   Source: Dong Chinese Dictionary