Stand him against a standard growth chart and he is almost a head shorter than he should be at his age.
当他靠着一张标准成长图表站着时，就可以看到他几乎比他的实际年龄矮了一头。
Jack is shorter than Tom by a head.
杰克比汤姆矮一头。
However, when the smaller males were given a one-day head start, reflecting their shorter maturation times in nature, they had a 10-times higher paternity rate than larger males.
但在考虑小雄蛛生来比大雄蛛有较短成熟时间这一因素而给小雄蛛一天的优先时，研究者发现小雄蛛比大雄蛛有高10倍的生育能力。
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