Mac Technique: Hotkey to enable Mac's dictionary

To look up a word in Mac's dictionary, highlight the word and press the hotkey:
啟動Mac內建字典的快捷鍵：

[control] + [command ⌘] + [D]

To add a new Traditional Chinese-English dictionary for users in Taiwan or Hong Kong, refer to this:

「教學」Mac 內建字典安裝繁體英漢辭典