1 sentence

1. 石头的大小可以不同，但它们通常是坚硬的白色。

   shí​tou de dà​xiǎo kě​yǐ bù​tóng, dàn tā​men tōng​cháng shì jiān​yìng de bái​sè.

   The stones can vary in size, but they are usually hard and white.

   Source: CCMatrix