adj.不轉(zhuǎn)動(dòng)的(未翻轉(zhuǎn)的；沒有轉(zhuǎn)向的)

Of course, social science research is almost never conclusive. There are always methodological difficulties and stones left unturned. 當(dāng)然，社會(huì)科學(xué)的研究幾乎從來沒有結(jié)論。總是有方法上的困難和人事未能盡到的情形。

The police left no stone unturned in their search for the missing child. 警察為了尋找這個(gè)失蹤的兒童，使用了一要手段。