删除当前卷标吗？
The current volume index for the stream.
流的当前音量索引。
Strong eddies and powerful current effects can be found, particularly on large-volume rivers.
强大的漩涡和强劲的水流影响会被发现，尤其在大容职的河流。
Strong eddies and powerful current effects can be found, particularly on large-volume rivers.
强大的漩涡和强劲的水流影响会被发现，尤其在大容职的河流。
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