type参数是用于传递所执行的命令，它指定了可选的缓冲区长度。

The type argument communicates the command to perform and is associated with an optional buffer with its length.

youdao

type参数是用于传递所执行的命令，它指定了可选的缓冲区长度。

The type argument communicates the command to perform and is associated with an optional buffer with its length.

youdao