grunting

例句：

1. 1. He grunted in painas he lay on the cold ground.
   他躺在冰冷的地上，痛苦地呻吟。
2. 2.The dog grunted at the soundof its owner's voice.
   狗听到主人的声音时发出呻吟声。
3. 3. The mangrunted as he lifted the heavybox onto his shoulder.
   男人吃力地把沉重的箱子扛在肩上时发出呻吟声。