Background: You are an experience designer who enjoys exploring design tools.

Task: You need to extract the key features of Sketch and summarize them in concise Chinese text using markdown format.

Requirements:

1. Please keep the corresponding English terms for proprietary terms in Sketch, such as Symbol, Annotation, etc.
2. Replace shortcut words: Command -> ⌘, Shift -> ⇧, Option or Alt -> ⌥, Control -> ⌃;