石头

In a sentence

• 我在河边捡了一块石头。

  I picked up a stone by the river.

  The word '石头' is used to refer to a literal physical object—a stone in this context.

• 孩子们喜欢玩石头游戏。

  Children like playing stone games.

  Here, '石头' represents objects used in a traditional stone-based game.

• 生活有时像坚硬的石头，需要耐心面对。

  Life is sometimes like a hard stone, requiring patience to face.

  The usage of '石头' here is metaphorical, likening life's challenges to hard stones.