可以单独调整难度，每个孩子都有一些。
The difficulty level can be adjusted individually – there is something for every kid.
裂缝没有明显主方向，且见水井没有明显的方向性，油田调整难度大。
Because of uncertain principle direction of these fractures and furthermore so do the watered-out oil Wells, so the adjustment is rather difficult.
免费大米可以根据你的词汇水平自动调整：一开始给你不同难度的词汇，然后基于你的反应，设定你的起点。
FreeRice automatically adjusts to your level of vocabulary. It starts by giving you words at different levels of difficulty and then, based on how you do, assigns you an approximate starting level.
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