1·Most fonts are equipped with at least two dashes: an en dash (-, -, which is the width of a lowercase "n") and an em dash (-, -, which is the width of a lowercase "m").
大多数字体都拥有二种不同的横线破折号：en横线(—，—，相当于小写的“n”的宽度)以及一个em横线(—，—，宽度相当于小写的“m”)。
2·Em-dash (-) : You're stuck up and pretentious.
破折号：你爱炫耀、自命不凡。