英语斜杠的应用规则
Slashes
有两种类型的斜杠:反斜杠backslash()和正斜杠forward slash(/)。反斜杠仅用于计算机编码。正斜杠，通常简称为斜杠slash，是英语中使用的标点符号。只有在诗歌、歌曲或戏剧的字里行间出现停顿时，斜杠后才使用逗号。
What Does / Mean Between Words?
文本中正斜杠的含义取决于上下文。斜杠可以有很多不同的含义，这取决于它们的使用方式。
To Separate Lines in Prose
斜线可以表示诗歌、歌曲或戏剧中的断行，通常是在几行短的行写在一个长行上的时候。考虑下面的两个例子:
Mary had a little lamb/ little lamb, little lamb/ Mary had a little lamb/ whose fleece was white as snow.
The quality of mercy is not strained/ it droppeth as the gentle rain from heaven/ upon the place beneath. It is twice blest:/ It blesseth him that gives and him that takes.
注意，每个斜杠后面都有一个空格。
To Indicate Or
通常，当斜杠在正式或非正式文本中使用时，它是用来表示单词or（即选择之一）。下面的例子说明了正斜杠的含义:
When leaving the classroom, the teacher noticed that a student had left his/her backpack.
College freshmen should bring a mattress and/or cot to sleep on during orientation.
If/when Mary ever shows up, we can all head out to the party together.
Burgers or pizza for dinner? Yeah, either/or is fine with me.
To Form Abbreviations
斜杠也可以用来构成一些缩写或单词或短语的缩写形式，尽管这些不应该在正式写作中使用。
w/o = without
w/ = with
c/o = care of (used when posting a letter or parcel)
a/c = air conditioning
注意，在这些情况下，斜杠后面不需要空格。
To Indicate Connecting and Conflicting Relationships
斜杠也可以用来表示句子中两个单词或短语之间的连接或冲突。一些例子包括:
The pro-life/pro-choice debate is a hot-button issue for many voters this election.
The designer often works in his bonus room/home office.
To Denote Dates and Fractions
正斜杠最常见的用法之一是表示日期和分数:
½
11/17/16
Space Before and After Slash
Many people wonder whether to use a space before and after slashes. It depends. When a slash signifies alternatives between only two words, don’t use spaces before or after.
许多人想知道是否要在斜杠前后使用空格。视情况而定。当斜杠仅表示两个单词之间的替换时，不要在前后使用空格。
当使用斜杠来表示短语或多词术语或复合词之间的替代时，斜杠前后的空格使文本更容易阅读。另一种情况下，斜杠后面的空格是可以接受的，当用于分割诗句、歌曲或戏剧时。在这种情况下，应该在斜线之后换行。
Example:Add chili flakes and/or black pepper to the recipe.
Example:World War I / First World War
Example:
Mary had a little lamb /
Its fleece was white as snow
