translation.en: So you can immediately apprehend the relationship between efficacy and popularity, but you can also, if you grade the evidence, do a "worth it" line.
translation.zh: 这样你能马上就领会效力 和受欢迎程度间的关系． 而且同时，如果你把证据分级别的话， 画出一条＂值得＂的线．