词：laggard
英英释义：a person who makes slow progress and falls behind others
例句：This cut-throat contest is not for losers and laggards.
go from a leader to a laggard
1）翻译下面的句子：
这个国家的经济一度落后，不过现在已经开始迎头赶上了。
This country, once a laggard in the economy, now is going to catch up.
(参考翻译：Once a laggard, the economy of this country is starting to catch up. 或 Long a laggard, this country's economy is beginning to pick up.）
造句：
After a breakthrough has been made by a team of famous Chinese scientists, China's energy technology goes from a laggard to a leader in a very short time.
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