The 'files' and 'chunks' collections will be prefixed with the bucket name followed by a dot.“files”和“chunks”集合将以bucket名称为前缀，后跟一个点。
Number of bytes stored in each chunk. Defaults to 255KB每个区块中存储的字节数。默认为255KB
Read preference to be passed to read operations要传递给读取操作的读取首选项
Write Concern as an object将关注点写为对象
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The 'files' and 'chunks' collections will be prefixed with the bucket name followed by a dot.“files”和“chunks”集合将以bucket名称为前缀，后跟一个点。