the reason of the number four in roman numerals sometimes are also be written as IIII instead of IV

The reason why the Roman numeral for four is sometimes written as IIII instead of IV involves both practical and historical considerations. Here's the explanation in both English and Chinese:

English: The use of IIII for the number four in Roman numerals has several reasons:

1. Consistency: Writing numbers in a consistent pattern of adding units (like I) was easier to understand and perform manually, especially when carving numbers into stone or other materials.
2. Historical Practice: Historically, Romans often used IIII for four as it followed the pattern of simply adding units without introducing subtraction.
3. Minimalism: Some theories suggest that using fewer letters or symbols for numbers was more aesthetically pleasing or practical in certain contexts.
4. Variability: There was no strict standardization for Roman numerals in ancient times, leading to some variability in how numbers were represented.

However, the use of IV, which employs the subtractive principle where V minus I equals 4, became more common over time and is now the standard way to represent the number four in Roman numerals.

中文: 罗马数字中数字四有时写成IIII而不是IV的原因包括：

1. 一致性：以一致的模式添加单位（如I）书写数字更容易理解和手动操作，尤其是在将数字刻在石头或其他材料上时。
2. 历史实践：历史上，罗马人经常使用IIII表示四，因为它遵循了简单添加单位而不引入减法的模式。
3. 简约主义：一些理论认为，在某些情况下，使用较少的字母或符号表示数字在美学上更令人愉悦或更实用。
4. 可变性：古代罗马数字没有严格的标准化，导致数字表示方式存在一定的变化。

然而，随着时间的推移，使用IV（采用减法原则，其中V减I等于4）变得更加普遍，现在已成为表示罗马数字四的标准方式。

This dual representation reflects the evolution and flexibility of the Roman numeral system, which was adapted over centuries to better fit practical needs and mathematical principles.