Finally it should be said that despite the negative attitudes towards the overcrowding of our good old Earth, longer life seems to have more virtues than drawbacks.

### 解释 virtues 是 virtue 的复数形式，virtue 的意思是"美德、优点、长处"。这个词源自拉丁语 virtus（力量、美德），在英语中既指道德上的优良品质，也泛指事物的优点或优势。