我校于一九八三年先后买回两台机械自动报时钟,用机械自动报时钟来代替人工打铃确实感到有许多益处。但是在使用过程中,我发现这类机械自动报时钟有如下缺点,便分别对它进行了适当的改进,使用了四五年,收效比较明显。 Our school bought back two automatic mechanical clocks in 1983 and did indeed find many benefits by replacing the artificial clock with a mechanical automatic clock. However, in the process of using, I found that such mechanical automatic clock has the following shortcomings, respectively, it has been properly improved, the use of four or five years, the effect is more obvious.