Because of their asynchronous nature, SIP servlets can seem complicated.
由于其异步本性,SIP Servlet可能看起来有些复杂。
You must be aware of or account for the asynchronous nature of replication if this is your chosen method.
如果选择这种方法,则必须清楚或考虑复制本身的异步性。
Note however that due to Ajax's asynchronous nature, showing reliable progress in Ajax applications is very hard.
但是要注意,由于Ajax的异步特性,在Ajax应用程序中显示可靠的进度非常困难。
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