A line is an effective element of design because it can lead the viewer's eye.

线条是设计中有力的要素因为它能引导观众的眼睛。

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It is a very important element though, and can lead the viewer through a wide range of emotions.

这是一个非常重要的因素虽然，并可能导致观众通过各种各样的感情。

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Lead is not a necessary element to crop growth but a pollutant with accumulation problems.

重金属铅不是作物生长的必需元素，而是一种对作物有积累性危害的污染物质。

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Until Thursday, when it was temporarily relieved, the 3-7th was the "tip of the spear, " lead element of the 3rd Infantry Division on the way to Baghdad, putting themselves out to receive the first frenzied shots.

CNN: At the Front: 'Unimaginable' firefight lasts 72 hours

Yes that's right, the base metal element lead, Pb, or more exactly the lead-based chemical compound Pb(CH2CH3)4 added to petrol to make car engines run more smoothly.

BBC: Does lead poisoning make you violent?

It is about 3 percentage points of GDP higher than the post World War II average an element that will lead many Republicans to reject it.

FORBES: High Hopes For Obama Deficit Panel's Tax Reform 2.0