Uncleared meaning of "Left/Right at Playback Position"

I have finally found out the meaning of "Left/Right at Playback Position".
For example, "Left at Playback Position" has two types of actions. When
playing or recording, it left current playback position be the **LEFT**
boundary of the potential selection, waiting for "Right at Playback
Position" to close it. When no audio playing or recording, it let the
current cursor position as **RIGHT* *boundary and opens a dialog to decide
left boundary. Here problem comes.

I'm confused on "Left at Playback Position". It is kind of mixed IMO,
mixing "(Set) Left (Boundary) at Playback Position" and "(Set Boundary at)
Left to Cursor Position".

In my predecessors' translation in Chinese (Simplified & Traditional), they
left something meaning "at Left-end(maybe meaning some point at left)
at(from) Playback Position" (在回放位置左端), it is not clear as well as in
English (I wonder if it is true in English). As a user, I was confused in
both language versions until I've read the manual.

If it is a real problem, I suggest using something like "Set Selection
Starting"/"Set Selection Ending" while turning the action in
no-audio-playing mode so that it can be understood and translated easier.

(OK not for 2.2.1 again)

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