“没入”用英语怎么说？

他们望着夕阳没入远处的山谷。They watched the sun set behind the distant dales.在仅剩的几个水坑里，河马根本无法没入水中。Hippos are unable to submerge in the few remaining water holes.群山渐渐没入天际.Hills melt into the sky....