赛季 sports competition season
塞翁失马，焉知非福 Misfortune may be an actual blessing¹.
三八红旗手 woman pace-setter
三八线 38th Parallel
360度环幕电影 Circamara
三班倒 three shifts
三步走战略 the three-step development strategy
三产 tertiary industry
三大法宝 the three main and effective method
三大作风 the Party's three important styles of work (integrating theory with practice, forging close links with the masses and practicing self-criticism)
三废(废气、废水、废渣） “three wastes”(waste gas, waste water and waste residues)
三分钟热度 brief period of enthusiasm
三高农业 "three highs" agriculture (high yield, high quality and high efficiency agriculture)
三个代表 three represents theory (the Party must always represent the requirements of the development of China's advanced productive forces, the orientation² of the development of China's advanced culture, and the fundamental interests of the overwhelming majority of the people in China.)
三个有利于 three favorables (whether it promotes the growth of the productive forces in a socialist³ society, increases the overall strenth of the socialist state and raises the people's living standards
三股企业 three-share enterprises—enterprises whose shares are purchased by government departments, local authorities and other enterprises
《三国演义》 The Romance of the Three Kingdoms
三好学生 merit student; three good student(good in study, attitude and health)
散户 retail⁴ / private investor⁵
三讲教育（讲学习、讲政治、讲正气） three emphases education (to stress theoretical study, political awareness⁶ and good conduct); stress the need to study, to be political-minded and to be honest and upright
三角恋爱 love triangle
三角债 chain debt
散客 individual traveler
三来一补企业 "the enterprises that process raw materials on clients' demands, assemble parts for the clients and process according to the clients' samples; or engage in compensation trade."
三连冠 three successive championships