sad expressions meaning in English

忧伤的表情

Suddenly , a sad expression appeared on her face
突然，她的脸上现出一抹悲伤的表情。
" please ? " i beg her . " you can look at a book till i get there . " she shuffles out and i round on the boys , already forgetting meimei ' s sad expression
拜托你了? ”我央求着她. “你可以现自己看书,我马上就到. ”美美慢慢吞吞地离去.我又回过头来看男生们在干吗,已经忘记美美一副不高兴的样子
About five years ago , a friend and i used to meet each week at local junk food restaurant to just hang out and chat ; however , as time passed , we started noticing a number of chinese people sitting alone with sad expressions
大约五年前，我和一个朋友每周都会去本地的一家餐馆闲聊，不久，我发现经常有一些中国人孤独的坐在那里，表情忧愁。