In a head-on collision, a rear-facing car seat spreads the energy of the crash across the toddler's entire back, not just across a narrowportion of a tiny body.
在正面相撞中，后朝向座位会使冲击力分散在婴幼儿的整个后方，而不是他小小的躯体上很窄的一部分。
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The time-domain filter can then be used to select the narrow central portion of the cross correlation function (CCF), capturing virtually all of the signal but rejecting most of the noise.