1·He has another, more novel theory to explain young people's thriftiness.
他还有其他更多理论来解释年轻人的节俭。
2·Thriftiness is a great quality; however, if you're too thrifty on a date, it spoils the romance.
节俭绝对是一个美德，但过分节俭真的是影响浪漫情调的杀手。