With PNG-compressed images, you do not provide the mask at all; the mask is derived from the alpha channel on the fly.

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。

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Using this model, the parameters of HEMT such as channel conductance, transconductance, gate capacitance, and cut-off frequency are derived.

由本文模型还推导出了HEMT沟道电导、跨导、栅电容和截止频率等微波参数表达式。

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The correlation between the effective energy of wind, and the wave, wind and siltation of channel was derived.

导出了“有效风能”与浪、沙、航道淤积之间的相关关系；

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"We are working on a few stand-alone films... derived from great Star Wars characters, " Disney CEO Bob Iger told the CNBC channel on Tuesday.

BBC: 'Stand-alone' Star Wars films planned