我曾有过这样的经历：一次四年级同学的“演习”课上，学到毛泽东1965年写的《念奴娇·鸟儿问答》，其中有一句是：“不须放屁，试看天地翻覆”。对于“放屁”一词，解释起来颇费周折，甚至羞于启齿，但又不能不讲。于是只好硬着头皮说明“放屁”有两个义项，其中第二个义... I have had such an experience: During the “exercise” class of a fourth grade student, I learned Mao Zedong’s “Nianjiao Bird Q & A” written in 1965, one of which is “Do not be a fan of flirting with heaven and earth.” As for the word “farting”, it has been troubling to explain it, even ashamed to say it, but can not but say it. So had to bite the bullet and explain “fart” has two senses, the second of which righteousness ...