139　by the lights of和in the light of

① by the lights of意为“借助于……的光线”，lights一定要用复数。

They climbed the hill by the lights of the moon. 他们借着月光爬山。

② in the light of意为“根据，按照”，其中的the可省略，后跟名词，也可跟what从句，相当于according to。

He made the decision in light of what he had heard. 他根据他所听到的做出决定。