He worked hard at training his eye and brain to tell the correct distance.

VOA: special.2009.03.18

And you've been working really hard to get on the soccer team, you've been training.

你为了能入选特别刻苦地锻炼，还参加了训练。

I was 课堂 - SpeakingMax英语口语达人

He would try to explain it this way when students asked for a top grade just for studying hard in chemistry class: What if a baseball player came to spring training and worked harder than all the others, but still could not play well.

VOA: special.2009.03.12

"We had been training long and hard for the mission, and we knew the baby was coming so it was easy to go on and do my tasks,"

VOA: standard.2009.11.30

Phil's working so hard. You know, spring training.

VOA: standard.other