2 sentences

1. 他脸上带着淡淡的忧愁。

   tā liǎn shàng dài zhe dàn​dàn de yōu​chóu.

   There was a faint look of sadness on his face.

   Source: Dong Chinese Dictionary

2. 他脸上露出一丝淡淡的忧愁。

   tā liǎn shàng lù chū yī sī dàn​dàn de yōu​chóu.

   A faint trace of sadness appeared on his face.

   Source: Dong Chinese Dictionary