He had always had a good memory, but the thrill of young love seems to have shifted a gear in his mind: from now on, he would start recording his whole life in detail.

他的记性一向很好，但稚嫩爱情带来的刺激，似乎转变了他的思想：从现在起，他要开始详细地记录他的一生。

youdao

The Father-Daughter Duel of ’54 shifted into high gear when you taught me to drive the old Dodge and I decided I would drive the ‘54 Chevy whether you liked it or not.

那时，您教我学开那部道奇旧车，可我却不管您喜欢不喜欢执意要开雪拂兰’54那辆车。 当时，我们父女俩关于雪拂兰汽车的争执也调到了最高挡。

youdao

I noticed that she was keeping the car in second gear when she clearly should have shifted to third, maybe even to fourth. Stupidly, I told her so.

我注意到她打在二档上，通常这种状况应是三档或四档，于是我告诉她该如此如此。

youdao

Three years ago BII shifted gear.

CNN: The Asiaweek Financial 500

Immediately, India's fielding shifted gear.

BBC: SPORT | Cricket | England | New-look India shine

But the constant game of cat-and-mouse had taken too much out of him to reply when Kirui shifted into high gear at the end.

WSJ: Half Marathon, Full Turnout