Wendy Zhang/ Shanghai Daily news

Local retired teacher Wang Muyun was disappointed on this year's Teacher's Day that she received no greetings from her former students.
Wang was not alone.
Only 35 percent of teachers in Shanghai received good wishes from their students on the Teacher's Day, which falls on September 10 every year, with most greeting-senders middle-aged people.
Wang, who retired 15 years ago, always cared about her students. When she was in service, she received many greetings from her students on the Teacher's Day. She put those hand-made greeting cards at remarkable places in her home to recall these old times.
However, her youngest students are now in their 30s. "The year before last year, she only received three calls from her students, but none for last year," said Wang's husband.
"In order to cheer her up, on last year's Teacher's Day, our eldest son called her pretending to be her student, but finally he was recognized by his voice," Wang's husband said, adding that they have to seek help from psychological doctors.
Among the nearly 30 students on Wang's address book, only eight have been reached recently. One of them working in Suzhou said she had thought of calling teacher Wang but forgot, and the other seven said they didn't know Wang's phone number.
Paying respect to teachers is one of the Chinese traditional virtues which students should cherish, said an educational expert.