In the same vein, assert is also used to test the internal state of a function-such as private member variables, or variables with internal linkage used strictly within the file.
同理，断言也被用来测试函数的内部状态，比如说私有成员变量或者文件的内部变量(variables with inner - linkage used strictly within the file .)。
2
Conclusion Case-sibling control design might avoid population stratification by using siblings as controls thus might be used to test association and linkage between genes and disease.