结果表明，保留密度的变化对树高生长影响不大，对林分胸径和单株材积的生长影响显著。
The results showed that the effect of the reserve density on the diameter and volume of individual tree were obvious.
半世纪以来，合理的城乡规划使英国得以保留令其他国家羡慕的乡村协调性，同时还允许低密度的城镇人口。
Half a century of town and country planning has enabled it to retain an enviable rural coherence, while still permitting low-density urban living.
发动机越来越小巧，却仍保留了大号发动机的动力密度，这时气门会承受更大的热量。
As engines get smaller, yet maintain the power density of a larger engine, the valves in them tend to take a greater beating.
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