正是因为义工们的无私奉献和许多好心人的慷慨解囊，这些命运多舛的动物才得以在收容所勉强存活下来。（It）

It is because of the selfless dedication of volunteers and the generosity of many kind-hearted people that these ill fated animals survived in the shelter。

It is because of the selfless dedication of volunteers and the generosity of many kind-hearted people that these ill fated animals survived in the shelter。