除了最左侧的复选符号之外，在右边的某一列中还有一些小三角。
In addition to the check mark symbols in the far left margin, there are small triangles in a column to the right of these.
最左边的矩形—名为EnterRoomInformation—包含一个人的符号，表示这是一个用户活动。
The left-most rectangle - named EnterRoomInformation - contains a symbol of a human, indicating that it's a user activity.
最左边的矩形—名为EnterRoomInformation—包含一个人的符号，表示这是一个用户活动。
The left-most rectangle - named EnterRoomInformation - contains a symbol of a human, indicating that it's a user activity.
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