I want to get to the point where a supersonic ticket is actually cheaper than subsonic.

想让超音速的票比亚音速的票价便宜一点。

Now, he was studying subsonic substance all day.

现他每天都研究亚音速的物质。

So you could do London to New York, but you had to slow down before you got to New York and be subsonic.

因此，从伦敦飞往纽约，但到达纽约之前必须减速，并达到亚音速。