按国家显示世界最常用的语言
获取世界上国家的列表.
| In[1]:= |  X |
| In[2]:= |  X |
| Out[2]= |  |
获取在每个国家最常用的语言列表.
| In[3]:= |  X |
| In[4]:= |  X |
| Out[4]= |  |
根据语言将国家分组.
| In[5]:= |  X |
以下是西班牙语最常用的国家.
| In[6]:= |  X |
| Out[6]= |  |
根据语言分组对世界地图着色.
| In[7]:= |  X |
| Out[7]= |  |
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