服务器检查该ETag，并判断出该页面自上次客户端请求之后还未被修改，直接返回响应304(未修改——NotModified)和一个空的响应体。
Server examines the ETag and determines that the page hasn't changed since last time the client requested it, so sends back a response of 304 (Not Modified) with an empty body.
如果Accept标头为空，这意味着该客户端可接受任何类型，因此设置了缺省值。
If the accept header is null, this means that the client accepts any type, so the default is set.
如果服务器端组件上的方法具有非空返回值，该值就会作为其惟一的实参传递进此回调函数。
If the method on the server-side component has a non-void return value, that value is passed into the callback function as its only argument.
对于ESX，虚拟基础结构客户端软件将会选择这个mac地址，因此可以将其保留为空。
In the case of ESX, the virtual infrastructure client software chooses this MAC address, so it can be left blank.
另一方面，如果服务器端组件上的方法具有一个空返回类型，则可以忽略此可选参数。
On the other hand, if the method on the server-side component has a void return type, then you can disregard this optional parameter.
端著空的容器，小心地好像装满东西时一样。
You should carry an empty container just as carefully as one that is full.
影响其背压的主要因素有：大气环境温度、空冷初始温差、凝汽器的端差。
The major factors effecting on the backpressure include atmospheric environment temperature, primary temperature difference of air-cooling, end difference of condensers.
岩溶地基突出问题不是地基强度而是地基稳定性，尤其是桩端岩体临空面稳定性。
The key problem of karst foundation is not the foundation strength itself but the foundation stability, especially the stability of the free face of rock mass on the pile tip.
请注意，在标记编译生成操作的默认行为下，您可以在代码隐藏端的分部类定义中将派生保留为空。
Note that under the default behavior of the markup compile build actions, you can leave the derivation blank in the partial class definition on the code-behind side.
发射端分集、编码和调制结合空时格码，可以有效地提高信号在无线衰落信道中传输的有效性和可靠性；
Space-time trellis code combining space diversity with code and modulation, can improve efficiency and reliability of communication system in wireless channel efficiently.
在纽柏林，法拉利侧进风口上的翼端帆和冷却用的烟囱被结合成单一物件，进一步强调其空力的作用。
At the nurburgring , the winglets and the cooling chimneys on the ferrari \ ' s sidepods have been combined into one single element , emphasising further their aerodynamic function.
缩颈翻边组合机是对马口铁空罐罐身的一端或两端进行缩颈与翻边的一种组合设备。
The novel necking and curling combination machine is a kind of combination equipment for can_body forming.
缩颈翻边组合机是对马口铁空罐罐身的一端或两端进行缩颈与翻边的一种组合设备。
The novel necking and curling combination machine is a kind of combination equipment for can_body forming.
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