从产品设计至实际投产间的时间的英文

lead-time

• 从:    follow
• 产品设计:    product design
• 至:    to; till; until
• 实际:    reality; practice
• 投产:    go into operation; ...
• 间:    space in between; ...
• 的:    4次方是 The fourth po ...
• 时间:    time; hour