Even normal racing produces enormous straining, requiting the helmet to protect the neck and spine.

甚至是一般的賽車運(yùn)動都會產(chǎn)生極大的張力, 這就要求頭盔能保護(hù)頸部和脊椎.

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When given a problem requiting multiplication or division, the computer solves it by adding or subtracting.

當(dāng)給計(jì)算機(jī)一道要求用乘法或除法求解的題時,它能用加法或減法解出.

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