concurrently execute 并发执行
All agents execute concurrently unless you explicitly restrict them.
所有的代理都是并发执行的，除非您显式限制它们。
In a concurrent program, different parts of the program can execute concurrently.
而在并发程序中，程序的不同部分可被同时执行。
Multiple threads can safely execute concurrently on all invocations except the first.
多线程能够安全并发地执行除第一次调用外的所有调用。
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