"he decided to go to Chicago on the spur of the moment"
"he made up his mind suddenly"
1. 一时冲动地, 立刻:proportional gain 比例增益 |onthespurofthemoment 一时冲动地, 立刻 | an alternate angle 错角
2. 一时冲动:onthe spot 当场 |onthespurofthemoment 一时冲动 |on tiptoe 翘首以待
3.
3. 立刻:onthe spot 当场 |onthespurofthemoment 立刻 |onthe square 正直
4. 一时冲动之下,不假思索的:Rent out 租出 |Onthespurofthemoment 一时冲动之下,不假思索的 | Analogous to...... 与......类似