翻译以下句子为英语：提示：1在写作文的时候百分比比如30要写成thirty percent of 2在频率是12的时候使用once或twice在3及以上时使用n times3percent是可数名词单复数同形4How come大意为怎么回事？
- When writing an essay, percentages, such as "30%", should be written as "thirty percent of ...".
- When the frequency is 1 or 2, use "once" or "twice", and for 3 or more, use "n times".
- "Percent" is a countable noun, and its singular and plural form are the same.
- "How come?" means "What's the matter?" or "Why is that?", depending on the context.
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