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问题: 帮忙翻译一下~~

1。20世纪下半叶
2。主观/客观条件
3。长江中下游/中上游
4。珠江

解答:

1、the late half of the 20th century
2、the subjective / objective conditions
3、the middle and lower reaches of the Yangtze River
the middle and upper reaches of the Yangtze River
4、the Pearl River