在火车的小卧铺车厢里，陌生旅客不得不成为临时的室友。

In the small sleeping compartment of the train, strangers had to become temporary ___bedfellows.

环保组织与石油公司成为合作伙伴，这对奇怪的组合引发了公众热议。

Environmental groups and oil companies have become ___bedfellows, an unexpected alliance that sparked public debate.