美 [ɡeɪn spiːd]
vi. 加速
加速
... gain 增长，增加的意思，如： gain speed 加速 gain height 变得更高 ...
加速
McGillicuddy's train slowed down again and the other began to gain speed.
麦吉利库迪的火车再次减速，而另一列火车开始加速。
At the same moment, Mrs. McGillicuddy’s train slowed down again and the other began to gain speed.
与此同时，McGillicuddy 太太的火车再次慢下来，而其它车开始加速。
Sometimes, , you just have to slow down to gain speed.
铁三，教会我有时候慢也是一种快。 。
The man pulls in the sail, causing the boat to gain speed.
VOA : special.2010.07.25
In addition, there is a strong possibility that American growth may gain speed, regardless of who is elected.
There is a lot of power for Operations here, and that means Cisco is aiming to gain speed and focus, at least temporarily at the expense of growth.
That might be the reason why, in recent years, the majority of the bowlers with suspect actions are spinners, even though it would seem more obviously tempting for a fast bowler to throw, in order to gain extra speed.