外部原始档指示词对编译并无影响，而且不可以是巢状的。
External source directives have no effect on compilation and cannot be nested.
预设情况下，有内部的存取时直接在一的命名空间内宣告和当巢状的私用存取。
By default, they have internal access when declared directly within a namespace, and private access when nested.
鳞状细胞癌，癌组织有由多边形细胞组成的癌巢，多边形细胞边界清楚，胞质为粉红色。细胞核染色深，形状有角。
This is the microscopic appearance of squamous cell carcinoma with nests of polygonal cells with pink cytoplasm and distinct cell borders. The nuclei are hyperchromatic and angular.
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