需求层次理论需求層次理論 (Maslow's) hierarchy of needs (psychology)
首次公开招股首次公開招股 initial public offering (IPO)
首次注视时间首次注視時間 (psychology) first fixation duration
一次生，两次熟一次生，兩次熟, 1.unfamiliar at first but you get used to it2.strangers are first meeting, but soon friends3.an acquired taste
大湄公河次区域大湄公河次區域 Greater Mekong Subregion (GMS), area of economic cooperation between China and Vietnam
第二次鸦片战争第二次鴉片戰爭 the Second Opium War (1856–1860)
上一次当，学一次乖上一次當，學一次乖, 1.to take sth as a lesson for next time (idiom)2.once bitten, twice shy
第二次汉字简化方案第二次漢字簡化方案 Second Chinese Character Simplification Scheme (second round of simplified Chinese characters, proposed in 1977 and retracted in 1986)