后续调用只需要两个参数：字符缓冲区及其长度。
Subsequent calls to send are made with only two arguments: the character buffer and its length.
后续的平面用于附加字符或其它还没有发明的编码实体。
Subsequent planes are used for additional characters or other coded entities not yet invented.
第二个和后续的参数为字符串，它们被当作子查询。
The second and subsequent arguments are strings, which are treated as sub-queries.
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