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。
2
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。
3
Laser as a heating source of high energy density of accurate control, can carry out multiple-sort strengthening treatment to the metal surface.