Superoxide dismutase (SOD) which is a clearance agent to free radical can clear lipid peroxides and is a role in protecting cells and tissue.

SOD是氧自由基的清除剂，能清除脂质过氧化产物，对组织细胞产生保护作用。

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Assess for possible impairment of airway clearance: increased work of breathing or inability to clear copious or tenacious secretions by coughing.

评估可能的气道清理损伤：呼吸功增加，或无法清除或咳出粘液。

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The Santro has high ground clearance to clear India's rocky roads.

CNN: INDIA'S CAR WARS

Freddie Sears volleyed wide after a corner was half-punched clear by Foster before a Larsson clearance hit Matthew Upson - playing at left-back - and forced Foster into a fine reaction save at his near post.

BBC: West Ham 2-1 Birmingham

The Ajax keeper had another nervous moment at the start of the second half when he beat Edinson Cavani to a through ball but failed to make a proper clearance and Van Bronkhorst had to clear Alvaro Pereira's curling shot off the line.

BBC: Uruguay 2-3 Netherlands