settle down怎样加动词?

settle down怎样加动词? settle down to 后面加什么 settle down settle down to是否后面能加doing settle down是什么意思 settle down 和settle 3Q settle in 和 settle down的区别 settle和settle down 的区别 They settle down还是They are settle down,哪个对 settle down 是及物动词短语吗 后面可以加 in+地点吗 calm down 与settle down 的区别 calm down与settle down区别