英語是：I am a cheerful, optimistic and responsible person.句子解釋：cheerful 英[ˈtʃɪəfl] 美[ˈtʃɪrfl] adj. 令人愉快的; 歡樂的，高興的; [例句]They are both very cheerful in spite of their colds他們倆雖然感冒了，可都興高采烈的。optimistic 英[ˌɒptɪˈmɪstɪk] 美[ˌɑ:ptɪˈmɪstɪk] adj. 樂觀的，樂觀主義的; [例句]Michael was in a jovial and optimistic mood.邁克爾情緒愉快樂觀。responsible 英[rɪˈspɒnsəbl] 美[rɪˈspɑ:nsəbl] adj. 負有責任的; 盡責的; 承擔責任; 懂道理的; [例句]He still felt responsible for her death他仍然覺得自己對她的死負有責任。