因此，您可以通过表锁或数据库中的其他同步字段来解决这个问题，以确保不会出现重复项。

So, you can address this with perhaps a table lock, or some other syncing field in the database to ensure duplicates don't appear.

youdao

放弃同步，而使用一个static字段。

Forgo synchronization and use a static field.

youdao

如果实现Runnable接口的类的setter(更新字段的成员函数)没有同步，则应该写明原因。

When a setter (a member function that updates a field) of a class that implements the Runnable interface is not synchronized, then you should document your reasons why.

youdao