If the orientations of driving elements are reversed then it is necessary to change a sign in their terminal relations . 如果驱动元素的定向取反了，就必须在它们的端子关系中改变符号。
2.
All our management and operational blueprints has adopted the core attributes of our csr value system and the key drivers of csr for attaining sustainable development 我们的管理及营运蓝图均已采纳企业社会责任的核心理念及当中的主要驱动元素，作为公司持续发展的基础。
