Note that the acknowledgement isn't just for one message, it acknowledges all the messages successfully received by the RMD.
注意，这种确认并不是与消息一一对应的，而是代表对所有由RMD成功接收的消息的确认。
Secondly, the RMD doesn't have to acknowledge the messages it has received.
其次，RMD并非必须对它已接收到的全部消息作出确认。
A sequence can be thought of as the "reliability contract" under which the RMS and RMD agree to reliably transfer messages from the sender to the receiver.
我们可将序列看作一个契约，在此基础上，RMS和RMD才能在发送者和接收者间实现可靠的消息传输。
The guarantee that WSRM - by itself - offers, is simply that the message was successfully transferred from the RMS to the RMD and that the RMD acknowledged it.
WSRM自身提供的可靠性保证，其实就是要求消息能从RMS到RMD成功传输，且RMD予以确认。
This means that you can have a persistent store behind the RMD, so the acknowledgement is only sent when the message has been written to disk.
在这个实现中，只有消息被持久化到磁盘后才会发出确认消息。
The RMD delivers these messages to the server application, maintaining any guarantees that it offers, such as exactly-once and in-order.
RMD将这些消息转送给服务端应用，并提供唯一性、有序性等基本保障。
Once the RMS has had all the messages that it has sent acknowledged, it can terminate the sequence. To do this is sends a TerminateSequence message to the RMD.
一旦RMS成功发送完所有消息，它就可以终结序列了，为此只需向RMD发送一个TerminateSequence消息。
Based on the measured data from the winter wheat fields in Zhengzhou of Henan Province, the vertical distribution of root length density(RLD)and root mass density(RMD)were analyzed.
根据在郑州进行的冬小麦根系田间实测资料，研究了根长密度和根质量密度在砂壤土中的垂直分布。
Based on the measured data from the winter wheat fields in Zhengzhou of Henan Province, the vertical distribution of root length density(RLD)and root mass density(RMD)were analyzed.
根据在郑州进行的冬小麦根系田间实测资料，研究了根长密度和根质量密度在砂壤土中的垂直分布。
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