马拉松参与者只占美国将近1,500万人经常跑步人群中的一小部分。

Marathoners represent only a small fraction of the nearly 15 million frequent runners in the U.S..

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支链淀粉是食松淀粉的主要成分，占总淀粉的84%。

Amylopectin was the major composition in pinyon starch, accounted for 84% of the total starch.

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根据教练Bob Larsen，对于美国奥林匹克马拉松奖牌获得者Meb Keflezighi而言，现在，“舒适地费力”配速占周里程15-20%。

Today, American Olympic Marathon medalist Meb Keflezighi puts in 15 to 20 percent of his miles at his "comfortably hard" pace, according to his coach, Bob Larsen.

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