2 sentences

1. 追思会是为了悼念已故的朋友。

   zhuī​sī​huì shì wèi le dào​niàn yǐ​gù de péng​you.

   The memorial service is held to mourn a deceased friend.

   Source: Dong Chinese Dictionary

2. 人们聚集在一起，沉痛悼念这位伟大的科学家。

   rén​men jù​jí zài yī​qǐ, chén​tòng dào​niàn zhè wèi wěi​dà de kē​xué​jiā.

   People gathered to deeply mourn the great scientist.

   Source: Dong Chinese Dictionary