South Sudan is reeling from an escalating conflict between the government-aligned army and opposition forces and allied groups that observers say risks returning the country to a full-blown civil war.
先是见面礼，要不要带啤酒，两个人来回说了好一阵。带几瓶，什么价位的，都是当地的礼数。再是红包。阿爸数着那边有几个孩子。可轮到封钱时，又犹豫起来，一百，还是两百？在我们当地，一百、两百的差别，往往意味着关系远近的差别。
。业内人士推荐新收录的资料作为进阶阅读
The good news: Astronomers know they can combine new cutting-edge instruments to track small, distant asteroids years in advance. Teams including NASA's Center for Near-Earth Object Studies rely on those calculations to monitor space rocks and comets that could someday pose a real threat to Earth.
每個虛構詞都對應到特定的物體。使用這類稱為「偽詞」（pseudowords）的方式，能讓研究者公平比較學習成果，因為學生無法依靠任何既有知識。