能够迅速使敌对双方连成一气的，是当双方都感受到一个潜在敌人的威胁，而这个敌人又比它们其中任何一方更具危险性。

Be that as it may, nothing will more swiftly unite two previous foes in a common front if they are threatened by a potential enemy perceived to be more dangerous than their erstwhile opponent.

youdao

我们必须使涡轮机坚固耐用，因为海洋是一个敌对的环境，但所有的迹象都表明我们能做到这一点。

We will have to make the turbines robust because the sea is a hostile environment, but all the signs that we can do it are good.

youdao

相互敌对有违自然本性；正是相互敌对的行为，既使人们烦恼，又使人们疏远。

To act against one another then is contrary to nature; and it is acting against one another to be vexed and to turn away.

youdao