I like to save phrases. This is especially true when I working on a language where I know many of the words but am not so good at using the language.
I highlight many phrases and save them.Then I usually use google translate to give me an English translation. I often know the meaning but it is easier to just copy from google translate. Then I have an English translation to use in the flash cards, especially when I do the reverse flash cards, from English to the target language.