这种方法通常称为「读取-修改-写入(Read-Modify-Write)。对于小于实体磁区的写入，磁碟必须读取实体磁区、修改磁区变更的小部分，然后写入整个实体磁区。
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(请注意，这里所说的“只读”是指数据一经写入数据仓库，后续的读取者就不能修改它)。
(Note that by "read-only", we mean that once data is written to the data warehouse, that data is not modified by subsequent readers).
任何进程都可以向共享内存区域写入数据，并且数据可以由其他进程读取或修改。
Any process can write data to a Shared memory region, and the data are readable and modified by other processes.
我们将一个侦听程序连接到传入的数据模型，当它侦听到一个修改时，将从数据模型中读取值并将值写入到UI字段中。
We attach a listener to the incoming data model, and when it is notified of a change, it reads the value from the incoming data model and writes it into the UI field.
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