2 sentences

1. 他们的婚姻坚如磐石。

   tā​men de hūn​yīn jiān​rú​pán​shí.

   Their marriage is rock solid.

   Source: CCMatrix

2. 他们的友谊是一如既往的坚如磐石。

   tā​men de yǒu​yì shì yī​rú​jì​wǎng de jiān​rú​pán​shí.

   Their friendship is as rock solid as ever.

   Source: CCMatrix