Then it probably occurred to you over the last 36 months that if you used hafnium instead of a tungsten alloy in the vacuum tubes, you could decrease the weight of each car by 30 kilos and get it to 500.
자네 얘기는 3년이 더 걸린다는 것 같은데 진공 튜브에 텅스텐 함금 대신 하프늄을 쓰면 각 객차마다 30킬로는 줄일텐데...