Eurasian steppes is located at latitude 50 degrees north of the strip of the Trans-Eurasia steppe zone, to form connections in the topography of natural channel and Western Eurasia.
2
用了PNG格式的图像，你不再需要提供mask了。 mask自然而然的由PNG的透明通道提供。
With PNG-compressed images, you do not provide the mask at all; the mask is derived from the alpha channel on the fly.
3
因此，通过使用Web服务描述语言(WSDL)等机制，通道自然具有自描述能力。
As a result, the ability for channels to self-describe becomes inherent through the use of such mechanisms as Web Services Description Language (WSDL).
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