To what extent competition determines the composition of a community and the density of particular species has been the source of considerable controversy.

竞争对于一个群落的组成和特定物种的密度的决定程度有多大，一直是相当有争议的问题。

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What's more, the temperature and density of the plumes could indicate a warmer, watery source beneath the surface.

更为重要的是，探测所得的温度和气流的密度表明，在星球表层以下有温暖潮湿的来源。

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Laser as a heating source of high energy density of accurate control, can carry out multiple-sort strengthening treatment to the metal surface.

激光作为一种精密可控的高能量密度的热源，可对金属表面进行多种强化处理。

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Those numbers explain why power density matters so much: if you start with a source that has low power density, you have to compensate for that low density by utilizing more resources such as land, steel, and ultra-long transmission lines.

FORBES: Magazine Article

If a source has low power density, then it will likely require too much real estate, material or space to provide the power that we demand at prices we can afford or in the vast quantities that the world needs.

FORBES: The Real Problem With Renewables

Tourism is creating other problems for the local environment, too, including increased population density, over-dependence on wood as a fuel and construction source and the overgrazing and cutting of mountain slopes to feed livestock.

BBC: Everest's growing problem