saving grace是什么意思?

可取之处
This book is very badly written, and its only saving grace is its interesting color photographs.
这本书写得很糟糕,唯一可取之处就是书上那些有趣的彩色照片。

要看具体用在什么句子里吧,,
给你一个网站翻译:

www.ONLINETRANSLATION.CN