The len argument defines how much data in buff is being written.
len参数定义了在buff中有多少数据要被写入。
When all the data have been written, set the eof (end-of-file) argument.
当所有数据全部写入之后，就需要设置eof(文件结束参数)。
His argument against the case was written to perfection.
他反对这个案子的观点被完美的写了下来。
The rule is written to the file named in its argument.
规则写进文件，文件名规则的参数中指定。
The rule is written to the file named in its argument.
规则写进文件，文件名规则的参数中指定。
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