How to Speak Politely

Guan Nainai: "Why do I feel a little guilty?" Lu Yanyan: "???" Guan Nainai inserted the straw into the Coke, took a sip, and said vaguely: "After all, plastic pollution is so serious now." Lu Yan said: "Then I understand." Then... Guan Nana watched him throw the new straw of another Coke into the trash can. She was so angry that her eyebrows stood up, "You are wasting resources."