让我们从两方面来研究这一过程，一方面是服务器端，另一方面是客户端。
Let's examine the process from two sides, the server side and the client side.
True：同步调用发生在客户端或者调用方的全局事务之外。
True: Synchronous invocations occur outside any client or caller's global transaction.
另外一方面，服务器端代码要更加复杂才能提供相应的功能。
The server side on the other hand is much more complicated to get right.
另外一方面，服务器端代码要更加复杂才能提供相应的功能。
The server side on the other hand is much more complicated to get right.
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