1.backbone 主干；主心骨；支柱

例句：As a group, they are meant to be the backbone of the market economy.
作為一個(gè)團(tuán)體，中產(chǎn)階級意味著市場經(jīng)濟(jì)的支柱。

2.when it comes to 當(dāng)談到；涉及到

例句：Yet the majority of these employees have no voice, especially when it comes to their own safety.
然而，這些雇傭員工大多數(shù)沒有發(fā)言權(quán)，尤其是涉及到自己的安全問題。
3.regardless of 無論；不管

例句：Every problem you have is your responsibility, regardless of who caused it.
不管是誰造成的，你都需要對你面對的每個(gè)問題負(fù)全責(zé)。

4.a total of 總計(jì)；總共；總數(shù)為

例句：The couple eventually took a road trip across the states killing a total of 11 people.
最終，這對同伙在穿越全美的公路旅行中一共殺害了11個(gè)人。