But I realized that while I was happy enough to bandy about five-letter abbreviations, I was less clear about what they meant or, more importantly, how we got here.

• 但我认识到，虽然我乐于使用这种五个字母的简写，但对于其含义，或者更重要的是，对于这项技术的产生过程并不很了解，而且并非只有我才存在这种问题。