Most observers would think the single-aisle Comac C919’s first flight last May (pictured) is illustrative of this, but while it is a key milestone, it does not represent the whole story about what is happening in the industry. Two other events are much more telling.
如果一部情景喜剧播出10年堪称流行，那么播出20年后依旧令无数人挂怀的电视剧则是经典。《老友记》1994年在美国首播，讲述了六个生活在纽约的青年男女的故事。现在，该剧已经是最著名的情景喜剧之一，在全球超过100多个国家和地区播出。
Moving away from fossil fuels to renewable energy is surely the most important engineering and scientific challenge of our age.
President Barack Obama won re-election to a second term in the White House on Tuesday, television networks projected, beating Republican challenger Mitt Romney after a long and bitter campaign。