最大的挑战来自于海水的固有密度，巨量的海水足以将最坚固的装置压碎。
The biggest challenge is water's inherent density. Accumulations crush all but the strongest gear.
昆虫和病原体是森林生态系统的固有成分，通常其密度相对较低，所造成的损害较小，对树木生长及其活力的影响微乎其微。
Insects and pathogens are integral components of forest ecosystems and normally are present at a relatively low density, causing little damage, and having negligible impact on tree growth and vigour.
平面密度变异是非单板类人造板所固有的结构特点。
Horizontal density variation (HDV) is an inherent characteristic of non-veneer wood composites.
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