子片段Subclips

子片段（Subclip）是从长片段里截出的独立片段——它引用同一个源文件，只覆盖原片入出点之间的范围，建多少个都不占额外磁盘空间。

• 只是引用不是复制：子片段和原片段共享同一个媒体文件，硬盘上不会多出一分体积。
• 独立的片段：子片段可以放进任何媒体夹，拥有自己的名称和元数据（初始继承自原片段）。
• 入出点定边界：子片段以创建时的入出点（In/Out point）为界，之后修剪不能超出这个范围。
• 宁宽勿窄：打点时前后多留几秒余量；真不够用了，右键 Edit Subclip 还能扩展边界。

A Subclip is a standalone clip carved out of a longer one — it references the same source file, covers only the range between its In/Out points, and takes no extra disk space no matter how many you make.

• Reference, not a copy: a subclip shares the original's media file — nothing extra lands on your drive.
• A clip in its own right: subclips can live in any bin and carry their own names and metadata (inherited from the parent at first).
• In/Out points set the limits: a subclip is bounded by the In/Out points used at creation, and trimming can't go beyond them.
• Better wide than tight: leave a few seconds of wiggle room when marking; if you run short later, right-click Edit Subclip extends the limits.