Example 2: "sweeping graves on behalf of others" has certain merits, because it conforms to the current social characteristics and can make up for the regret that people can't worship their ancestors in a foreign land. (It is enough to be reasonable, but the expression should be standardized)
This question examines the simplicity, coherence and appropriateness of students' language expression. Existence is a reason for its existence, which can be agreed or denied, as long as it is justified.