1.undefined adj.不明确的，未下定义的
　　【例句】The money was left for an undefined period of time.
　　这笔钱无限期借出。
　　2.undercharge vt.索价低于常价，充电不足 n.低索价，充电不足
　　【商务用语】undercharge a company for shipments
　　对某公司少算装运费
　　3.understanding n.谅解，理解
　　【商务用语】understanding economics 理解经济学
　　verbal understanding 口头谅解
　　a tacit understanding 默契
　　come to/arrive at an understanding
　　达成协议，取得谅解
　　【例句】They finally reached an understanding.
　　他们最后达成谅解。
　　4.undertake vt.承担，担任，许诺，保证；采取
　　【商务用语】undertake fresh responsibility
　　担负起新的职责
　　undertake a task 开始进行一项任务
　　【例句】I can't undertake that you will make a profit.
　　我不能担保你会获利。
　　5.undertaking n.事业，承诺，殡仪业
　　【商务用语】undertaking expenditures 事业经费
　　undertaking of wide scope 大企业
　　undertaking revenue 事业收入
　　welfare undertakings 生活福利事业