These systems lock files so that only one developer has write access to the central repository at a time.
这些系统对文件进行加锁，这样在某个时间只有一个开发人员对中心仓库具有写入权限。
The s lock allows concurrent applications that use read-only queries to access the target table, but applications attempting to write data to the table are prevented from doing so.
s锁允许使用只读查询的并发应用程序访问目标表，但是防止应用程序写数据到表中。
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