dash 二三事

— em dash 最長
– en dash  次長
- hyphen  最短

em dash 可被     ;   :   ,     其中一個取代
Mary hates Jim—everyone hates him.
= Mary hates Jim; everyone hates him.
= Mary hates Jim and everyone else hates him as well.

Mary hates Jim—she hates everyone.
= Mary hates Jim; she hates everyone.
= Mary hates Jim but she hates everyone.
= Mary hates Jim—oh, but she hates everyone.

Mary hates three men—Jim, Sam and Tom.
= Mary hates three men: Jim, Sam and Tom.

Mary hates her boy friend—Jim—kindly.
= Mary hates her boy friend, Jim, kindly.

range, distance  用 en dash
1–9
March–October
Taipei–Manila flight

compound words 用 hyphen
non-applicable
mid-October
yes-no question

Notes:
以上 em dash, en dash 的電腦輸入, 我用 Microsoft Office New Phonetic IME 2010 輸入法。 全形中打hyphen - , 會跳出選單, 可選長短兩種 dash。