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

我想让超音速亚音速价便宜一点。

Now, he was studying subsonic substance all day.

现他每天都研究亚音速物质。

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，它可以从伦敦飞往纽约，但到达纽约之前必须减速，并达到亚音速。