theobromose

例句：

1. 1. The obsidianis a very hard stone that can beused to make tools and weapons.
   玄武岩是一种非常硬的石头，可以用来制作工具和武器。
2. 2. The obsidian is alsoknown as black glass, becauseit has a dark color.
   玄武岩也被称为黑玻璃，因为它有深色。
3. 3. Theobsidian is found in manyplaces around the world, including in theUnited States.
   玄武岩在世界许多地方都有发现，包括美国。