S/he must be able to make difficult trade-off decisions, often involving complex economic factors.
他必须能够做出艰难的权衡决定，这通常会涉及到复杂的经济利益。
Physics is a rather complex subject involving the study of matter and motion.
物理是一门非常复杂的、涉及物质与运动研究的学科。
More complex repairs, often those involving data recovery, could take days.
更复杂的维修，往往是那些涉及数据恢复，可能需要天。
Road traffic project management is a complex and systematic project involving a number of factors.
公路工程项目管理是一项复杂的系统工程，涉及到诸多要素。
Road traffic project management is a complex and systematic project involving a number of factors.
公路工程项目管理是一项复杂的系统工程，涉及到诸多要素。
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