postscript (P.S.) 附記

A postscript(P.S.) is a sentence or paragraph after a letter, an essay, or a book
（附記是在書信、文章或書本結束後加上的一句或一段話。）　

comma　逗號
The comma is a punctuation mark that is used mostly to separate parts of a sentence and to separate single items in a list.　
（逗號是用來把一句話分段，或為一連串的項目做間隔的標點符號。）

colon　冒號
The colon is commonly used to introduce a list of things.　
（冒號後常跟著一串清單。）

periods　句號
Periods are used in abbreviations and decimals, but they are most commonly found at the 　　end of sentences.　
（句號可作為縮寫的符號或是小數點，但最常見的還是在句子結尾。）