stay silent是动词短语，in silence是介词短语。
stay silent: 保持沉默
He recommends that we don't stay silent over inappropriate behaviour， particularly with regular visitors.
他建议我们不要对不恰当的行为保持沉默，尤其是对常客。
in silence: 沉默地
Let your smiling lips say on oath how my voice lost itself in silence like a drunken bee in the lotus.
让你含笑的唇儿发个誓，告诉我我的声音怎样在沉默中消失，像一只在荷花中沉醉的蜜蜂。
