It found that these teens are more likely to engage in substance use behaviors related to attempted suicide or that contributed to violence among other things .
报告发现此类青少年更容易卷入致瘾物质滥用，自杀企图，以及其他一些由暴力导致的行为。
Reduction in substance caused by erosion .
由侵蚀引起的物质减少。
Firm or compact in substance .
紧密的物质上牢固的或致密的。
But despite the barbs traded in the debate the two men set out a series of policies that were sometimes close to each other in substance with notable exceptions among which tax and spending policy was particul
Peter delany an expert in substance abuse and director of the substance abuse organization 's center for behavioral health statistics and quality says many of the shifts reflect overall national demographic changes .
