2 sentences

1. 这是一项失传的艺术。

   zhè shì yī xiàng shī​chuán de yì​shù.

   This is a lost art.

   Source: CCMatrix

2. 写信是一门失传的艺术。

   xiě xìn shì yī mén shī​chuán de yì​shù.

   Letter writing is a lost art.

   Source: OpenSubtitles