汽车是由不同的零部件组成的，它们在车组装好之前就已经存在了。
Cars are made up of parts that existed before the car itself existed.
现在中国从这些国家和地区进口零部件，组装为成品后出口给美国。
China now imports components from these countries, assembles them and exports the finished goods to America.
中国大约一半的出口由来自进口零部件组装而成的商品构成。
About half of China's exports consist of goods that have been assembled from imported components.
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