2 sentences

1. 空气中含有大量的氮。

   kōng​qì zhōng hán​yǒu dà​liàng de dàn.

   The air contains a large amount of nitrogen.

   Source: Dong Chinese Dictionary

2. 在一些旧的文献里，氮元素常被写作淡。

   zài yī​xiē jiù de wén​xiàn lǐ, dàn yuán​sù cháng bèi xiě​zuò dàn.

   In some old literature, the element nitrogen was often written as the character '淡'.

   Source: Dong Chinese Dictionary