This is some of the most useful effect footage available!

这是一些最有用的画面效果提供！

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The whirling is one of the main reasons of decreasing the life and the useful effect of PDC bits.

PD C钻头的涡动是影响其使用寿命和效果的主要原因之一。

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Secondly, I analyse the main medium of visual sign in graphic design and design the visual sign accoding to the specialty of medium , then analyse the useful effect in communication field.

现代平面设计中符号语言清晰，明了的以最有效的途径进行传播已经成为平面设计中至关重要的问题。

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Such an armada might not, however, be necessary to produce a more modest but still useful effect.

ECONOMIST: Fiddling with clouds could help tame hurricanes

The interaction has to have a useful effect damping down the activity of a protein that is too abundant, perhaps, or stimulating that of one which is not abundant enough.

ECONOMIST: Computers may give new life to old medicines

It also has a useful political side-effect, easing some of China's tension with America over the value of its currency.

ECONOMIST: China��s roaring growth cannot last indefinitely