... 外周余隙角(铣刀的)|peripheral clearance angle 外柱|outer column 外转子电机|external rotor electric machine ...
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Figure 8 shows that the left outer join operations are cascaded if a rule USES more than one reference column.
图8展示了如果规则使用了多个参考列，那么左外部连接就进行级联。
Only electrons in the outer shell can form chemical bonds, so the elements in each column are chemically similar.
只有外层内的电子才会形成化学键，因此每一列中各元素化学性质均相似。
Elements in the first column all have one electron in their outermost shell. Those in the second column have two outer electrons, and so on.
第一列元素最外电子层内均有一个电子，第二列元素则含有两个电子，依此类推。
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