Theworld’s largest oil importer, China is an irreplaceable trade partner both forIran, the would-be leader of the Shia world, and for Saudi Arabia, its Sunninemesis.
作什么成分呢？省略了as吗？
谢谢老师。
The world’s largest oil importer, China is an irreplaceable trade partner both forIran, the would-be leader ofthe Shia world, and for Saudi Arabia, its Sunni nemesis.
你在句首加上 as 也可以，但不加也可以。
不加as的话，可将 The world’s largest oil importer 与China 理解为同位关系。
补充解答：你的句子主语是China, the world’s largest oil importer 为同位语。
依据《张道真英语语法》第411页：在主语比较短时，同位语常可提前。
