This primitive form of vegeculture (cultivation of root and tree crops) may have been the economic tradition onto which the cultivation of summer rainfall cereal crops was grafted as it came into use south of the grassland areas on the Sahara's southern borders.
as是翻译成因为还是当什么时候,use在into后面是名词词性吗?use后面接了一个south怎么理解?
...as it came into use south of the grassland areas on the Sahara's southern borders.
1. as 表示“当......时候”,因为它引导的从句跟主句无法构成“因果关系”。
2. come into use 是个“习语”,use 是名词,不要拆开分析。意为“开始使用;投入使用”。
3. south of 是“复合介词”。 south of = to the south of (在......南部。不接壤)
...as it came into use south of the grassland areas on the Sahara's southern borders.
【直译】当它在撒哈拉南部边界草原地区以南的地方投入使用时 (意思是:在草原地区以南的地方开始使用。)
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