这意味着应先了解和学习这整个库，再学习剩余的部分也不迟。
This means that they can be studied and understood in their entirety without knowing anything about the rest of the Ext library.
与外国人打好交道，应先了解跨文化交际的内涵，把握中西文化的差异。
Has the social dealings with the foreigner, should understand the first Trans-Culture human relations the connotation, grasps China and the West culture the difference.
食物：应先了解客人有无忌嘴的食物，如是否为素食者，是否为不食猪肉及鳞鱼类的犹太人。
Food: should first understand the customers to the mouth of wild foods, such as whether vegetarians do not eat pork and whether the Jews of fish scales.
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