`still water run deep.

`still water run deep. 是still water runs deep 还是 still water run deep? still waters run deep Still waters run deep! Still water runs deep. 谚语still water run deep. 但是water 是不可数 run 应该加s啊 还有run 在这里是什么意 谚语still water run deep.但是water 是不可数 run 应该加s啊,这是为什么? still waters run deep in this one still waters run deep中的deep是副词还是形容词? still water than deep 的意思是什么? 谚语翻译still water runs deep 静水常深什么意思翻译成英文是 still water run deep 好像是英文谚语但是具体是什么意思 不太明白 恳请