The phrase su tance abuse is often used I tead of drug abuse to make clear that su tances such as alcohol and tobacco can be just as harmfully misused as heroin and cocaine .

药品滥用这个词经常被用来代替毒品滥用，其目的是为了表明酒精和烟草这样的物质是可能像海洛因和可卡因那样被误用的。

The basic su tance of price change is human emotion . Panic , fear , greed , I ecurity , anxiety , stre , and uncertainty are the primary sources of short-term price change .

价格变化的基本要素是人的情感。慌乱、恐惧、贪婪、不安全感、担心、压力和犹豫不定，这些是短期价格变动的主要根源。